Sudden framedrops. (Advice needed)

[SO•Marty]

Update:
Went on TC tonight, drove 70 kms, went off, no issue.
Went online for a second time and got the same issues.
Did eventvwr but I couldnt find anything. I deleted a program which seemed to cause troubles (didnt use it anyway), but that wasnt the trick.

What I notice:
When frames and sound lag, and at that time I press Shift+O, the menus work just fine. It seems more hardware related than anything else, but my music and such in the background continue to play and music responds to their designated buttons.
To me it seems like LFS is asking something from the GPU/CPU which they cant handle for a brief time. LFSLazy says that when the frames drop CPU/GPU usage dont increase when the drops happen.