Hey there,

i*ve tried the same and for me it's getting even more worse than before. Mouse starts to jump around after an hour uptime +/- a few moments.

While typing this text Firefox crashed at least 2 times =(

I don't know about the temperature since i don't have a thermometer for my CPU, nontheless i'm pretty sure it can't be high since my CPU-fan runs slow (speed of my fan is controlled by CPU-temp).

Apps running right now:
NetnewsWire
Firefox
Thunderbird

Transmission crashed while i was sleeping so i had to restart my machine around an hour ago.

Update:
My machine crashed completely this time. The loading circle appeared and that's it .... another restart.

I really hope someone is able to find a solution.

Cheers,
Tom