This could be same as  Issue 700719  hence cc'ing maxmorin@ for help in further investigation and confirmation.

hemanth@: When this happens could you please go to chrome://webrtc-internals and under "Create Dump" check "Enable disagnostic audio recordings" and "Enable diagnostic packet and event recording"? Then upload the resulting files here for further debugging. 

Max: can you check comment #4?

Impossible to say without a recording or some other sort of debug information.

Regarding #4: It is very likely not the same as that issue.

ajha@: Can you please get back with a recording and ask for a more thorough description of the issue?
Otherwise, I think we should link this to an existing echo issue and close if, as it is known that there are echo issues, and as we are rolling out a new AEC solution which is designed to fix issues like this.

Waiting for dump file as per C#4 and for confirmation whether this is still an issue on the latest stable.

[Re-triage] It's been four weeks without reply, so I'm closing this and we can re-open if reporter comes back with the needed data.

hemanth@: if you encounter this again, please follow the instructions in comment #4 and re-open the bug.