GTX 260M Underclocking after stock overclock

Hi guys, I'm having a little trouble after overclocking my gpu (to stock settings on a G72GX) and playing Borderlands for a while.
I can play ok for like an hour or 1:30 and after that it underclocks as if I were using my laptop on battery (383 Core clock, 500 Memory clock and 550 shader clock). I've been monitoring my temps with GPUZ and it reaches 87 °C at its peak. As far as I know, this is more than acceptable for the GTX 260M.
Also, I noticed in GPUZ that the voltage changes from 0.95v to 0.85v.

Can anyone help me prevent this underclocking or explain me why does it happen?
Does this have something to do with powermizer?

Thanks in advance.
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