VOD Chat starts from beginning when waking device from sleep

[nullstalgia]

Title has most of it right there, but in more detail:

Whenever I have the stream focused on my device, I put it to sleep with the power button, then unlock it: the chat will start from the beginning and zoom down to the current timestamp, showing all previous messages as it makes its way down.

Tested on release b3f4fdc, on two Samsung devices.