Keith,
I have to start by saying that 90% of the problems that people have are caused by their own configuration. So let's play the odds and start with that:
1) Did you try a second (or third) browser? This is a MUST!! Install Chrome AND Netscape. Both are FREE. Then, using one of them, go to Chat and do all that you normally do. See if there's any difference. I'll repeat what the experts say -- Microsoft IE has problems.
2) Do you have cookies enabled within your browser? Chat will ONLY allow you to stay logged in if you have an active cookie. Go through the browser settings to find out. Or search the Internet to find the specific steps... example, search Google for "Browser Cookies Enabled"
3) If you still have problems, send me a PM and tell me what Operating System you have (eg. XP, Vista, Win 7, or AOS) and what browser you use (eg. IE, Netscape, Chrome, Safari, etc) and finally what version it is (eg. 7, 8, 9, or 10, etc)