almost once every month, sometimes cgminer just randomly freezes for no reason..
I dont think I have ever saw cgminer freeze. The only times I have had to restart it was when a card showed up dead or sick.
What version of cgminer are you using? I still think it comes down to finding a good mix between Intensity, TC, clocks, and driver.
It toook me almost two weeks of testing to get my rigs running right. But now I dont have to touch them for months.