Crash when typing

Any game I play on, whether I host or im on someone else's world I crash after a certain period of time WHEN typing. Not before or after, I only crash in the middle of typing or when hitting send. When the game crashes, it freezes up my entire PC and I have to restart it. I've checked and I have no viruses, no idea how or why this happens. Sorry if I made this report wrong, first time.