Guild Wars 2

I had terrible lags after the karka event for about 4 weeks, after that they suddenly disappeard.

Yesterday they began again.

Anyone having the same issues or knows what is the problem there?

Dunno. ANet keep silence, im not sure if they are watching this forums at all.
This thread, for example:
https://forum-en.gw2archive.eu/forum/support/tech/Network-Lag-Merged/page/19

19 pages, but only gw2 team post is the first one. No any instructions what to do to check what is the problem.

You can read this:
https://forum-en.gw2archive.eu/forum/support/tech/FAQ-Frequently-Asked-Questions-Compilation/first#post1095406
But this is just FAQ and most likely it will not help.

Hm, I think they do not know where the problem is or it is just impossible or nearly impossible to fix it.

I mean I find it just weird that it worked for 2 months now and suddenly it does not.