High ping problems

I have a normal ping of 70-100ms. I live in Turkey.
Randomly my ping pops to 300ms, checked with service provider, restarted router, restarted pc, checked if anything is background downloading, didnt get any results. I bumped a video, they recommend to turn off windows auto update and seems it helped a bit, but still having the issue. The problem begun after last update. Thanx in advance.

Did you try these steps?

Can you post any network tests you have performed?