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Computer crashes playing League of Legends, no BSOD
I hope this is in the right place. If not, I'm sorry.
Anyways, my computer has a problem that has probably existed since I got it, but it's only in the last few months that it has cranked up in frequency other than "extremely rarely". When the problem happens, the computer stops and hangs indefinitely: screen stops updating, sound cuts off immediately. I usually do a hard reset to get on with life. The scary part is that there is no BSOD, and there are no crash dump files generated.
Usually when the problem happens during a game of League of Legends, I quickly reboot and reload back into the game. During this time, gameplay quality is noticeably degraded for the whole duration, and sometimes it gets so bad, I have to lower the graphics settings to make the game playable again. This quality issue goes away if I haven't used the computer for a while.
While this problem does happen when I play League of Legends, it's apparently not unique to that game. It can also happen when I have been on some VOIP service for a very long time, watching streams + playing an intensive flash game (or otherwise asking the Flash VM to do lots of work), or compressing a long series of uncompressed (Fraps) screencapture videos. It gets even weirder: the computer doesn't crash when I'm playing Starcraft 2 or Age of Empires Online, and I frequently get moments in both games where it starts lagging pretty badly (15 fps or less). At least, it hasn't yet.
Frequency of these crashes can be somewhat predicted based on how often I use the "bad" software, but there is one time a very long time ago when two crashes happened literally within a few minutes.
I don't have the complete information about my desktop specs, but hopefully I have uploaded enough information. If not, please let me know.
Thanks in advance for the help.