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Random system crash

Hello, I have HP EliteBook 8440p. Last week I updated from fedora 24 to fedora 25. A few days go I got random system crash. I was browsing internet when my laptop screen went black and the CPU went on full performance. After 10 second the computer turned itself off. When I booted it back on, it acted like nothing happened. I looked in journalctl, but I didn't find any error. Last few entries were from chromium and then just -Reboot-. After 30 minutes it did the same thing. Again, I didn't find any errors after rebooting. Weird thing is it only happened twice and only that day. No crash since then. Since then, I ran hard-drive check, memtest86, and some tests in bios. None of them found any hardware problem. Could you please help me solve this problem?