Reseating cooler fixed temps, but problems continued on the second day

[coloshadow]

Hello. I suddenly faced problems with my CPU temperatures 2 days ago. The CPU was idling at 45 degrees and skyrocketed to 100 degrees when starting up games and eventually resulting in a blue screen error(CLOCK_WATCHDOG_TIMEOUT). I replaced the thermal paste on my cooler(H100i) with the NT-H1 and reseated it. Temps were now normal - Idling at 30-35, and below 60 degrees in games. Today, I booted up my PC and found that it idles at 45 degrees again and when running a game, it gets to 80 degrees.
What could be the problem and how do I fix this?
My PC specs:
Intel i7 4790k @ stock speeds
Corsair H100i
EVGA GTX 780 ACX Superclocked
2X4GB Corsair Vengeance DDR3 RAM
Asus Maximus VII Hero Mobo
1Tb HDD. no SSD
750W Seasonic M12 II power supply

Any help would be much appreciated!

 

[jay32267]

I think there is a good chance that the fasteners (screws) that hold the cooler down are shifting or coming loose.