Question Computer extremely slow. reboot fixes the issue. sometimes

Mar 3, 2020
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Ever since I bought my PC 3 years ago I had this problem, though now I finally had enough.
When I boot my PC, one of the following may occur:
  1. All is normal.
  2. No monitor output whatsoever.
  3. I log into windows and everything is super slow. Opening a browser takes ~10 seconds.
I ran furmark and got ~10 FPS on a 1920x1080 test.
When all is normal I get ~100 FPS.

Ran the Intel processor diagnostic and passed in modes 1 & 3.
Specs:
gigabyte z97m-ds3h
GTX 1070ti (previously had a GTX 960 with the same problem)
Intel i7-4790

Any ideas how to debug would be appreciated.
 

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