Why do I get thrown out of tournaments?

This has happened twice today ... I win a game in a Live 10 min tournament, leave the game, and find that I am no longer in the tournament! This was previously never the case, you just left the game and waited for the next round, watched other games or whatever  ... why has this been changed? As a free member I only get 3 tournaments a week and have been robbed of 2 today!

You should write an email to support and ask this. No one can tell you without knowledge of what tournament you were in, etc. 

Ok good idea, will do! I was just wondering if I'm the only one it's been happening to.

This happened to me if I went in to Explorer or had Explorer open during the tournament.  When I'm in tournaments now I close other windows back to home page and just stay in the tournament. I only browse other games in the tournament.  They could have updated something too at the same time you were in the tournament and your bad luck it affected you.

Seems to be ok now, I cleared the cache and since then no more problems. Thanks though!