Another thought...
CPU overheating?
This seems to fit the bill, you get random flakiness at intervals depending on how hard you work the CPU. What could be happening is this: computer turns on, computer heats up, CPU heats up past safe operating levels, computer reboots, CPU cools down a bit...
Solution: Check your motherboard's manufacturer's website for tools/utilities to help keep CPU temp in a safe range and AMD's support page for ideas. If this does not lead anywhere consider getting a better heatsink and/or fan. Cheap test for this is to run with the case off and a domestic fan blowing on the motherboard....
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