Example URL:
http://wigo.teads.tv/livedebug/demo.html?vast=http://be-get.teads.tv/get/1550&format=inread

Steps to reproduce the problem:
A. if I have Spotify open and playing a music if I go directly to http://wigo.teads.tv/livedebug/demo.html?vast=http://be-get.teads.tv/get/1550&format=inread with a video playing, everything is working fine, the music continues

B. but if I'm redirected to the same page my sound is lowered a lot (from 100% to 20%, something like that) and when I scroll to the video and this one is starting (without sound) the music on Spotify is stopped.

B.1. Start a background music (Spotify for example)
B.2. Go to http://wigo.teads.tv
B.3. Click the button "test this vast" (let the field empty) 
B.4. Wait for redirection to http://wigo.teads.tv/livedebug/demo.html?vast=http://be-get.teads.tv/get/1550&format=inread
B.5. Scroll to the video
B.6. The music Stops

So it's really strange, the behavior is really different if we come to the page with our player directly, OR via a redirect (button for example) 

=> maybe linked to the referrer, when we have a referrer, the bug append, but when no referrer (ex we manually fill the url in the browser) everything is ok

What is the expected behavior?
The background music shouldn't stop
if I go directly to http://wigo.teads.tv/livedebug/demo.html?vast=http://be-get.teads.tv/get/1550&format=inread with a video playing, everything is working fine, the music continues

What went wrong?
The background music stops
if I'm redirected to the same page my sound is lowered a lot (from 100% to 20%, something like that) and when I scroll to the video and this one is starting (without sound) the music on Spotify is stopped.

Did this work before? Yes 

Is it a problem with Flash or HTML5? HTML5

Does this work in other browsers? Yes

Chrome version: 67.0.3396.87  Channel: stable
OS Version: 6.0.1
Flash Version: 

Contents of chrome://gpu: 
Graphics Feature Status
Canvas: Hardware accelerated
CheckerImaging: Disabled
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Disabled
Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
Rasterization: Hardware accelerated
Surface Synchronization: Disabled
Video Decode: Hardware accelerated
Viz Service Display Compositor: Disabled
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
Driver Bug Workarounds
clear_uniforms_before_first_program_use
disable_framebuffer_cmaa
dont_disable_webgl_when_compositor_context_lost
max_msaa_sample_count_4
max_texture_size_limit_4096
scalarize_vec_and_mat_constructor_args
use_client_side_arrays_for_stream_buffers
use_virtualized_gl_contexts
Problems Detected
ARM driver doesn't like uploading lots of buffer data constantly: 178093
Applied Workarounds: use_client_side_arrays_for_stream_buffers
The Mali-Txxx driver does not guarantee flush ordering: 154715, 10068, 269829, 294779, 285292
Applied Workarounds: use_virtualized_gl_contexts
Clear uniforms before first program use on all platforms: 124764, 349137
Applied Workarounds: clear_uniforms_before_first_program_use
Always rewrite vec/mat constructors to be consistent: 398694
Applied Workarounds: scalarize_vec_and_mat_constructor_args
Limit max texure size to 4096 on all of Android
Applied Workarounds: max_texture_size_limit_4096
Use GL_INTEL_framebuffer_CMAA on ChromeOS: 535198
Applied Workarounds: disable_framebuffer_cmaa
Disable KHR_blend_equation_advanced until cc shaders are updated: 661715
Applied Workarounds: disable(GL_KHR_blend_equation_advanced), disable(GL_KHR_blend_equation_advanced_coherent)
eglSwapBuffers intermittently fails on Android when app goes to background: 744678
Applied Workarounds: dont_disable_webgl_when_compositor_context_lost
Don't expose disjoint_timer_query extensions to WebGL: 808744
Limit MSAA to 4x on Android devices: 797243
Applied Workarounds: max_msaa_sample_count_4
Raster is using a single thread.
Disabled Features: multiple_raster_threads
Native GpuMemoryBuffers have been disabled, either via about:flags or command line.
Disabled Features: native_gpu_memory_buffers
Surface synchronization has been disabled by Finch trial or command line.
Disabled Features: surface_synchronization
Viz service display compositor is not enabled by default.
Disabled Features: viz_display_compositor
Checker-imaging has been disabled via finch trial or the command line.
Disabled Features: checker_imaging
Version Information
Data exported	2018-07-18T11:28:24.706Z
Chrome version	Chrome/67.0.3396.87
Operating system	Android 6.0.1
Software rendering list URL	https://chromium.googlesource.com/chromium/src/+/878cd31214ac27a3996927cd5c9c138b10c9fc8d/gpu/config/software_rendering_list.json
Driver bug list URL	https://chromium.googlesource.com/chromium/src/+/878cd31214ac27a3996927cd5c9c138b10c9fc8d/gpu/config/gpu_driver_bug_list.json
ANGLE commit id	702006f4a07e
2D graphics backend	Skia/67 78b60f4ff13b83da98ae2bca85aaef0a98b61098-
Command Line	--use-mobile-user-agent --use-mobile-user-agent --enable-pinch --enable-viewport --validate-input-event-stream --enable-longpress-drag-selection --touch-selection-strategy=direction --main-frame-resizes-are-orientation-changes --disable-composited-antialiasing --enable-dom-distiller --flag-switches-begin --flag-switches-end --top-controls-show-threshold=0.5 --top-controls-hide-threshold=0.5 --top-controls-show-threshold=0.5 --top-controls-hide-threshold=0.5 --top-controls-show-threshold=0.5 --top-controls-hide-threshold=0.5 --top-controls-show-threshold=0.5 --top-controls-hide-threshold=0.5 --top-controls-show-threshold=0.5 --top-controls-hide-threshold=0.5 --top-controls-show-threshold=0.5 --top-controls-hide-threshold=0.5 --top-controls-show-threshold=0.5 --top-controls-hide-threshold=0.5 --top-controls-show-threshold=0.5 --top-controls-hide-threshold=0.5 --top-controls-show-threshold=0.5 --top-controls-hide-threshold=0.5 --top-controls-show-threshold=0.5 --top-controls-hide-threshold=0.5
Driver Information
Initialization time	153
In-process GPU	false
Passthrough Command Decoder	false
Direct Composition	false
Supports overlays	false
Sandboxed	false
GPU0	VENDOR = 0x0000 [ARM], DEVICE= 0x0000 [Mali-T830] *ACTIVE*
Optimus	false
AMD switchable	false
Driver vendor	
Driver version	1.
Driver date	
Pixel shader version	3.20
Vertex shader version	3.20
Max. MSAA samples	4
Machine model name	SM-A520F
Machine model version	
GL_VENDOR	ARM
GL_RENDERER	Mali-T830
GL_VERSION	OpenGL ES 3.2 v1.r12p1-03dev0.ed32a5440f20c29503930f67988bdcc5
GL_EXTENSIONS	GL_EXT_debug_marker GL_ARM_rgba8 GL_ARM_mali_shader_binary GL_OES_depth24 GL_OES_depth_texture GL_OES_depth_texture_cube_map GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_EXT_read_format_bgra GL_OES_compressed_paletted_texture GL_OES_compressed_ETC1_RGB8_texture GL_OES_standard_derivatives GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_image_external_essl3 GL_OES_EGL_sync GL_OES_texture_npot GL_OES_vertex_half_float GL_OES_required_internalformat GL_OES_vertex_array_object GL_OES_mapbuffer GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_type_2_10_10_10_REV GL_OES_fbo_render_mipmap GL_OES_element_index_uint GL_EXT_shadow_samplers GL_OES_texture_compression_astc GL_KHR_texture_compression_astc_ldr GL_KHR_texture_compression_astc_hdr GL_KHR_texture_compression_astc_sliced_3d GL_KHR_debug GL_EXT_occlusion_query_boolean GL_EXT_disjoint_timer_query GL_EXT_blend_minmax GL_EXT_discard_framebuffer GL_OES_get_program_binary GL_OES_texture_3D GL_EXT_texture_storage GL_EXT_multisampled_render_to_texture GL_OES_surfaceless_context GL_OES_texture_stencil8 GL_EXT_shader_pixel_local_storage GL_ARM_shader_framebuffer_fetch GL_ARM_shader_framebuffer_fetch_depth_stencil GL_ARM_mali_program_binary GL_EXT_sRGB GL_EXT_sRGB_write_control GL_EXT_texture_sRGB_decode GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent GL_OES_texture_storage_multisample_2d_array GL_OES_shader_image_atomic GL_EXT_robustness GL_EXT_draw_buffers_indexed GL_OES_draw_buffers_indexed GL_EXT_texture_border_clamp GL_OES_texture_border_clamp GL_EXT_texture_cube_map_array GL_OES_texture_cube_map_array GL_OES_sample_variables GL_OES_sample_shading GL_OES_shader_multisample_interpolation GL_EXT_shader_io_blocks GL_OES_shader_io_blocks GL_EXT_tessellation_shader GL_OES_tessellation_shader GL_EXT_primitive_bounding_box GL_OES_primitive_bounding_box GL_EXT_geometry_shader GL_OES_geometry_shader GL_ANDROID_extension_pack_es31a GL_EXT_gpu_shader5 GL_OES_gpu_shader5 GL_EXT_texture_buffer GL_OES_texture_buffer GL_EXT_copy_image GL_OES_copy_image GL_EXT_color_buffer_half_float GL_EXT_color_buffer_float GL_EXT_YUV_target GL_OVR_multiview GL_OVR_multiview2 GL_OVR_multiview_multisampled_render_to_texture GL_KHR_robustness GL_KHR_robust_buffer_access_behavior GL_EXT_draw_elements_base_vertex GL_OES_draw_elements_base_vertex
Disabled Extensions	GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent
Disabled WebGL Extensions	EXT_disjoint_timer_query EXT_disjoint_timer_query_webgl2
Window system binding vendor	
Window system binding version	
Window system binding extensions	
Direct rendering	Yes
Reset notification strategy	0x8252
GPU process crash count	0
Compositor Information
Tile Update Mode	One-copy
Partial Raster	Enabled
GpuMemoryBuffers Status
ATC	Software only
ATCIA	Software only
DXT1	Software only
DXT5	Software only
ETC1	Software only
R_8	Software only
R_16	Software only
RG_88	Software only
BGR_565	Software only
RGBA_4444	Software only
RGBX_8888	Software only
RGBA_8888	Software only
BGRX_8888	Software only
BGRX_1010102	Software only
RGBX_1010102	Software only
BGRA_8888	Software only
RGBA_F16	Software only
YVU_420	Software only
YUV_420_BIPLANAR	Software only
UYVY_422	Software only
Display(s) Information
Info	Display[0] bounds=[0,0 360x640], workarea=[0,0 360x640], scale=3, external.
Color space information	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Bits per color component	8
Bits per pixel	24
Video Acceleration Information
Decode vp8	up to 3840x2160 pixels
Decode vp8	up to 3840x2160 pixels (encrypted)
Decode vp9 profile0	up to 3840x2160 pixels
Decode vp9 profile0	up to 3840x2160 pixels (encrypted)
Decode vp9 profile1	up to 3840x2160 pixels
Decode vp9 profile1	up to 3840x2160 pixels (encrypted)
Decode vp9 profile2	up to 3840x2160 pixels
Decode vp9 profile2	up to 3840x2160 pixels (encrypted)
Decode vp9 profile3	up to 3840x2160 pixels
Decode vp9 profile3	up to 3840x2160 pixels (encrypted)
Decode h264 baseline	up to 3840x2160 pixels
Decode h264 main	up to 3840x2160 pixels
Decode h264 extended	up to 3840x2160 pixels
Decode h264 high	up to 3840x2160 pixels
Decode h264 high 10	up to 3840x2160 pixels
Decode h264 high 4:2:2	up to 3840x2160 pixels
Decode h264 high 4:4:4 predictive	up to 3840x2160 pixels
Decode h264 scalable baseline	up to 3840x2160 pixels
Decode h264 scalable high	up to 3840x2160 pixels
Decode h264 stereo high	up to 3840x2160 pixels
Decode h264 multiview high	up to 3840x2160 pixels
Encode vp8	up to 1280x720 pixels and/or 30.000 fps
Encode h264 baseline	up to 1280x720 pixels and/or 30.000 fps
Log Messages
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.

=> maybe linked to the referrer, when we have a referrer, the bug happens, but when no referrer (ex we manually fill the URL in the browser) everything is ok