cheating by " losing" connection '...

Your last thread on this was locked. https://www.chess.com/forum/view/general/clock-cheating-i-am-about-to-give-up-my-membership-of-chess-com
People did try to explain to you why you were wrong before it was locked.
Did you read them? The most important point was that you are not directly connected to an opponent during a game, so there is no way for them to affect your connection.
After they lock this thread you may wish to consider that the proper place to discuss these things is in the Cheating Forum, a club you can join.

I think you just have a poor Internet connection lol. What you're describing isn't possible
It is not impossible.
I've not looked into chess.com's protocol, but let's assume it's plain TCP (or anything that runs on top of it). If player B wants to terminate player A's connection, he can simply (say) inject TCP reset packet. Now, player B needs to know player A's IP address; or even if he can just narrow it down to a network, he can send it to every address on that network. My old ISP allowed me to send any addressed IP packets, so injection isn't any problem. To be tricky, player B can even send packets to simply mess up the TCP sequences.
But I don't think anybody cares enough to do this. I think the true problem is bugs in chess.com's software.