Why do my miners keep on closing?

[SeanArce]

I turned the sleep option off on my computer

I'm using guiminer

[ralphjb]

Do you get an error message or is it a spontaneous crash that you don't discover until you look for your miner later and are like WHERE THE FFFF ARE MY COINS?

[Synethstesia]

Gonna need more info friend... Open up the console in GUIminer and tell us what type of errors you're getting.