I have the same issue. RX 480 8GB, 16.9.2 drivers, windows 10 64 bit, latest windows cumulative updates as per Tuesday 11 October (successfully installed).
My firefox TY vidoes used to crash, did ddu, then updated to 16.8.2 - no crashing, then updated to 16.10.1 using DDU and now TY videos black out sporadically after 30-40 seconds upong starting playback, then AV,return but now flickers badly so YT unwatchable. Chrome browser works fine so that is my workaround for now.
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Turn off hardware acceleration.