My woes in the nightly freeroll continue...

I don't know what it is recently.  I got one bad beat (gutshot straight on the river), one call I shouldn't have made (but it got a little personal), and then one tonight (an all-in call with AK against a loose aggressive player who HAPPENED to be holding 88).  I play really tight for about an hour and then in literally ONE HAND, I'm out.  I'm not sure what's going on.  Maybe I get tunnel vision on good hands.  I think I just need to work on my concentration and keep reminding myself, "You can't win this tourney with one hand, but you can sure as hell can lose it."