I have a AMD 64 3400+, and it was overclocked 10%, core at 1.5v

when I first did it, I was getting good stablity, and good temperatures
about 35 (I think, it was about 100F) degress C at idle, and about 54 on full load

a few nights ago I installed Battlefield 2, and I try to play it and I was getting crashes, and thats when I noticed my CPU temp was higher then before.
I am getting 44C on idle while overclocking and about 40 w/o.; don't want to know what my load temps are..
also, my core is set at 1.5v but everest reports it as ~1.45v sometimes..

what could cause this increase?.., fan RPM's are good, ect.