Game window crashes

Hello, I play on 2 accounts and over the last couple of weeks one of the windows will randomly disappear. It just drops to the desktop with no error message. I've also tried this with Rift with 3 accounts and the same thing is happening there too.
If I play with only one account they don't crash.
Here's the info for SWTOR.

http://www.privatepaste.com/d6773be338

[MiRai]

You don't happen to have something bound to ALT+F4 do you?

Just checked all my keybinds and I don't. Didn't know that alt+ f4 would close the game window. Thanks or the info.