probably just a jacked up computer. might want to try using a different computer or mybe even try your phone? if it doesnt rattle and make you quit or whatever and your still losing on time you might want to enable premoves in settings. hope this helps.
Clock Issues
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I've been playing 5 0 (live chess) and I lose on time at around 3 minutes.
What's going on?
I even get the rattling sound around then and the game aborts.
Weird.
And when I lose it says I resigned.