It's a common enough problem that they wrote an article about it. Chess.com is a bit of a memory hog so ...
https://support.chess.com/article/213-how-do-i-fix-my-disconnect-lag-issues
Irregular disconnects from games.
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Let me preface this with that my internet connection is (in general) quite reliable and I have very few problems.
I've been experiencing multiple games I've been playing my opponent's clock begins to run for a very long time for seems to be no reason. If I let this go on too long, I'll refresh the page and get a message saying that I lost due to a disconnection, even though it never appeared to disconnect on my end. This has lead me to start refreshing the page every time my opponent's clock runs a minute or so, and oftentimes when I refresh I'll load back in and my opponent will have moved a while ago, and it only updated on a refresh! I tried disabling my adblocker, but this doesn't appear to remedy the issue. Has anybody else dealt with this issue and have any solutions to suggest?
Thank you.