Game Crash?

Loving the game so far, but it seems like my game has encountered the frequent occurrence of the 'fm.exe has stopped responding and needs to close' issue.

The timing isn't constant, one time it broke down after about 4 games, most recently it broke after my second game finished.

Both times it occurred after I Alt-Tab-ed out to access a different window or the internet. Suddenly it'll tell me it stopped responding and needs to close.

So is it actually alright for me to change game window or do I have to keep saving, quitting and re-opening the game?

Cheers