It's possible someone mentioned another chess site or another chess server. Once that happens, say goodbye to your topic.
Even with a supposedly 7.6 million members here, Chess.com likes to pretend the other servers don't exist... I guess they're worried a few members will move over and start plying there, or something.
How come my topic was locked?

my topic got locked and i don't know why and it had the most posts of any topic i have started