Some applications crash, or start up very slowly unless I restart my PC.

Hi all,

I have had this issue for a couple months and can't seem to find a good resolution via searching online.

Basically, upon turning on my pc everything works flawlessly, games load instantly, nothing will crash for a couple hours, everything is great.

After those couple of hours, games will take 3-4 minutes of hanging as if crashing before they will start, if I close steam I cannot reopen it without restarting my pc completely, it just hangs in the background and never starts, some games will begin to crash randomly.

Specs: Gtx 1080 Intel I5 6600 16GB RAM

I built the PC myself, and rarely get this stumped, but it's been months and I havent found a fix, hopefully you guys have some ideas?

Let me know if you need any more info on the problem.