High Ping/Latency

Hello everyone. Just wanted to ask if anybody knows a solution to high latency while playing WoW. It happens on all servers and realms. Had this problem for about 2-3 years, came back to check it out if the problem was still here, unfortunately....
I get from 600 to 2000ms randomly and it never goes down, I have to logout and comeback again. It stays 40ms for about few seconds or if lucky minutes and then jumps to 2000ms again. I cant talk to npc's, cast spells, all players are running in place. Sometimes npc and players dissapear altogether. I used to play on this server 6 years ago and never had a single problem with latency. If anyone knows anything that could help, please share, thank you

Hey, are you still having this issue?