De-sync and deaths all the time

I never experienced it in this heavy way but at the moment i de sync like 70% of the time.
This makes playing dungeons (which i did) nearly impossible and it killed me multiple times because of a freezing screen or 4/5 sec de-sync.

I hope you guys can quick fix this. Its the first time iam quitting the game because iam not able to play it. The MS oddly enough sometimes goes high but at many times it de-syncs while it still shows a blue (low MS).