I come back to my PC after awhile and it will have an open dialog, but for no reason I can make sense of. Can you tell me how to track down why?
Specifications, Screenies? What OS? What does the dialogue look like (Is it a window with a message or are you on about a chatroom output done by your computer alone?) If you want answers you'll need to provide more information for people to hazard a guess, or we'll just end up with weird comments with no apparent relevance.