Heat. Almost certainly its heat.
Simple test - run the computer with the case off. (As a side note, dont drink coke/beer/anything near it in this condition. Gets expensive). If it is heat the crashes will stop or at worst be significantly reduced.
New fans & heatsinks should take care of it. A coating of arctic silver (or other good thermal paste) between the sink and the CPU/GPU will help.
The other problem with heat is expansion. This leads to creep - components expand, contract, and move in their sockets. Possibly a component is breaking contact when hot. The fact the computer takes hours to come back supports this theory. Reseat everything, just to make sure.
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