This just happened out of nowhere. 
And transmission used to work just fine and I've kept my mac on for days downloading stuff on transmission but now i can't be away from the computer too long, if I have smthng downloading. Somebody please tell me what the issue is! 
Im using Transmission version 2.82 (14160) and my system is Mac 10.9.1
I realised I was manually putting the computer to sleep by pressing Command+Option+Eject instead of Control+Shift+Eject (Only Screen turns off). 
