It's the same with me. I can usually do it for about 3-4 months...and then the mis-management, ridiculous decisions, and the blame game (IE: I get blamed for a poor planning decision) gets to me and I want leave.

Now, I only work part-time for someone while my company is growing. It makes enough now to pay me and the other 2 founders a comfortable salary..but I can juggle both until my company gets too busy.