play less when running bad?

[pearljam]

I find anymore ill sit down to play a long session, have 1 or 2 losing sets, get sick and then sighn off. its not that bad, 25 buy ins at the 30+3, but man are the actual in game beats horrible. How can I mentally cope with this better and be able to grind through a 50 SNG session winning or losing when it seems like im in the "middle of a bad run".

Edit: In a sence I guess its a good thing that I sighn off before I start making marginally stupid plays and get emotionally off balanced, I just wish I could stay at my top game wile im in a bad streak and in the middle of a bad session.