I was in tournament and i didnt click anything but the game window changed page to a page saying 'Url not found' i clicked back and it had logged me out of game and tourny so i lost the tourny. Any help on stopping this from happening?, Its happened a few times today.

same has just happened to me!

with me if im not using the forum or anything and just playing after a while just logs me out

Yep does it to me as well.