Chrome:	64.0.3282.144 (Official Build) (64-bit) Revision 0
Platform: 10176.68.0 (Official Build) stable-channel edgar
Firmware Version	Google_Edgar.7287.167.96


What steps will reproduce the problem?
(1)Login to device
(2)Play any Youtube video (YouTube video is in Full Screen mode, about 2+ hrs of video selected and put in loop mode)
(3)Connect External Monitor (used ASUS 1080 HD monitor with HDMI cable) and Audio is audible from external monitor
(4)Put the device in Docked Mode. (Video/Audio plays from external monitor)


What is the expected result?
Audio & Video is played from external monitor/display without any issues. 

What happens instead?
1. No display is seen on external monitor after 1 hr 15 mins of video is played.
2. White screen is displayed on external monitor
3. Audio was still audible
4. In the same session, tried to connect device with another external monitor with HDMI cable and no display is seen.
5. After unplug-plug white screen goes to grey (on first monitor), but that's it. Re-plugging shows the notifications for plugging a display
but no improvement


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Logs and screenshots attached.  

For graphics-related bugs, please copy/paste the contents of the about:gpu
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