Untraceable stability problem of 3.6.8 kernel on ASUS P53E

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http://unix.stackexchange.com – Randomly, but not later than after 10 hours of work, the laptop freezes. Just freezes. Knowing that not all hardware errors are reported back to the user I tried the netconsole. Unfortunately the netconsole also didn't output anything at the time of freeze. The only correlation I've found is that usually, on next powering up (after forced powering off) the laptop consumes 10W more power. But I suspect it might by a concidence; this behaviour is not limited to the times, when system was powered on after the freeze. After 1.5 (on average) times rebooting, the power consumption is back to norma (HowTos)