I think this tends to happen when one is underbankrolled for the limit they are playing. If you have a sufficient bankroll for your limit it makes it a little easier not to start plaing weak/tight after a bad run. I used to do this but that was when I was underbankrolled and was prone more to tilting. Also, I feel that playing uber tight isn't a horrible way to get through a bad run, as opposed to tilting chips away.