There is also an unjustified ' freeze' when you are trying to move . The Clock is still running but the pieces won't move.( I dont mean when in ' Check '. )
Flashing Clock and Disconnect
This is really annoying. I guess at least when the clock flashes I can refresh (and lose whatever time has passed) to get back into the game but more recently the clock doesn't even flash half the time, so it looks like the opponent is thinking, but the clock will either run down or I'll refresh and get notified that I lost (either on time or because I was "disconnected" for too long.) Obviously it makes bullet hard to play but even rapid when it is somewhat normal for an opponent to take a minute to think is almost impossible to play without refreshing every 5 seconds.
I live in a major US city with decent high speed internet but even if there is a blip in the wifi the site should be able to handle it more gracefully.

This has happened to me three times this morning. It doesn't happen it seems when I'm home with a really fast connection. Maybe that's got something to do with it.

Just happened to me....again!!! Can someone...anyone, look at this game and tell me, where was it, that I lost the match at!? Opponent had exactly 0:08 seconds left on the clock when the clocks started to flash and after about the 5th flash, I had lost and he had mysteriously gained, extra time and an imaginary win!
https://www.chess.com/game/live/29482215421

From looking at this guys other games, it appears that he gets his wins, like that...without even a checkmate, nor time...just wins.
Dalglish1977

I looked at his page his games don't look suspect. HIs last win was by checkmate he lost two matches before that. And the fact you say this happens to you alot, I think it is a problem with your internet. From what I can tell you lost by resignation. Still can't believe how horrible the analysis is where it doesn't even specify besides the flag icon next to the king on the board.
I most definitely didn't resign the match. I was winning on time, alone.
Same here
Annoying.