Hey first of all. I've tried searching for a similar thread but could not find any, bear with me in case I missed something like that, also this is my very first post as my friend directed me here. So my problem is: I keep getting this random issue in which my computer starts spiking/freezing every about 1 second for 0,5 seconds of duration. - With random I mean: that there is no scheme regarding a time-frame, sometimes it doesn't appear for a week or two, sometimes I get it twice in a few days. and also I can not figure any kind of thing which would be the trigger for it - simply because I've had it happen during idling at the desktop just after booting, also during gaming sessions and hours of usage. (windows 7, 64 bit, clean install - no upgrade) This includes a freezing in my music if I listen to any, my mouse cursor, simply everything. I have tried using the task manager to eventually identify the possible cause - however I was not able to do so, also my usage is not more than 30-35% tops > ram usage. Today it happened during idling in the starcraft 2 lobby while connected to the multiplayer, however I had causes in which it triggered just after booting and / or not being connected to the internet. So far my solution (the only one I came up with) is rebooting the computer and waiting for it to appear again, which might be a day, a week, maybe even two or three weeks, but eventually it will appear again. As a competitive gamer it is kinda needless to explain that when this occurs in a match, it basically means an auto-loss for me - therefor it kinda strikes on my nerves as it isn't that much of a bother if I am not playing, as a simple reboot would solve it for a while - but if it triggers in a match (which I had happen a couple of times by now) it would cost me an eventual important match/game while not being able to replay that given game. Monitoring my everest tells me that the sensors are never overheating either which would be a valid explanation for it, also I did various kind of malware / anti virus checks (full version of kaspersky) which were all without any kind of reports. PC Specs: - Cpu: QuadCore Intel Core i5 750, 2633 MHz (17 x 155) - Motherboard: Gigabyte GA-P55M-UD2 (2 PCI, 2 PCI-E x16, 4 DDR3 DIMM, Audio, Gigabit LAN, IEEE-1394) - Ram: 4091 MB (DDR3-1333 DDR3 SDRAM) 2x 2gb - Graphic Card: Sapphire Radeon HD 4870 1GB GDDR5 - Windows 7, 64 bit, clean install - no upgrade, like mentioned above already. - HDD: 380 GB on the only non storage partition with 260 GB still free. Thanks in advance.