It's a thing called variance.  Smaller pools, BTC Guild is hardly a "big pool" these days, have allot of variance in which it has spells of really good luck and solves allot of blocks quickly.  Win, win.  But when it has bad luck it is allot more noticeable.  You need to average over longer period of time.

Any way, everybody PLEASE post in the appropriate thread.  BTC Guild has it's own thread and eleuthria will answer questions like this and has, even recently.  Also us BTC Guild miners will answer you too.  There is no need to keep creating new threads and filling up the forums with duplicate subjects.
Thanks,
Sam