Huge network issues

I started playing this game last league and had this issue from the start. What issue? Network stutters and ping spikes up to thousands (96k ms VMax). I've seen many threads about it and the answer is nowhere to be found, my friends play this game perfectly fine. I have internet connection via LAN cable and my network is 600 Gb/s fiber optic cabel. This is what I am experiencing atp:

https://imgur.com/a/kbMYtB1

I have already tried everything:

Resetting shader cache
Changing gateways
Modifying firewall settings
Lowering every single performance option (sound, graphics, etc.)
Running steam file compatibility
Updating all drivers and Windows updates
Changing DNS
Resetting router to default settings

This happens always from 7 pm CET to 12 pm CET and sometimes earlier. Throuought the campaign I've observed that creating new instance of a map helps a lot. In endgame i need to use waystones over and over to find stable map to play (around 3-4 waystones on average) because GGG does not let me create new instance for some unknown reason. If someone from GGG/tied to GGG can answer me please I would be glad. Please don't mention windows MTR, your guide is clueless and does not show host adress to check only REPLACEME.

Identical issue here, dying or changing locations till i have stable instance. Otherwise spike from 600 to 99999ms

I have the same problem, in the loading window it says (Milan 66ms), and after entering the game the ping is at least 400ms, it is impossible to play

Same issue here. It has been happening for over 2 hours.