Weird computer freeze

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ok, well a while ago my computer started to periodically freeze, by which i mean there would be no response to anything and screen would freeze. If i was playing music then a buzzing noise would be heard as well. It slowly started to get more frequent (nearly every 15 mins) and only option was to unplug and restart. In the end i replaced the graphics card, all the ram, then finally the motherboard. Everything worked great for a few months, however in the last two days it happened again. The pc will probably last around 4 hours without it happening but it will slowly decrease. I am TOTALLY confused and would appreciate any ideas/suggestions that could help me find out what it is.
Thanks!

PS let me know if any of you want the specs
 
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