Random Lag and Teleports

Hello, I recently started having an issue on the Frostmourne server where I'm getting a lot of random lag on abilities, and occasionally teleporting backwards to where I was maybe .5-1 sec ago. I've been playing on Warmane for about two months and have had no connection issues or lag until this problem started happening randomly about 3 days ago.

This problem is sometimes accompanied by latency spikes, in which my latency will shoot up to 400-1000 out of nowhere. However, even when my ping is normal (around 150-200 because I live in NA), I still experience lag on my abilities as well as random teleports. My PC and internet are both pretty good, and I have not experienced any similar issues in other games, or with streams/shows. I also tried to replicate the issue on Classic WoW with no success, and have also done speedtests during these times where I experience lag, as well as checked all of my processes and PC usage for any potential problems, but haven't found anything that stands out. This leads me to believe that the problem is something that may have changed between my connection and Warmane servers.

I understand that this is probably a weird sounding issue, but is there anyone who has any suggestions on how to fix my problem? I was hoping the problem would have worked itself out after a day or so, but it seems to be persisting, and I'm starting to get very frustrated because it makes certain aspects of the game (such as PvP) feel unplayable because I'm just constantly getting teleported around. Any help would be greatly appreciated.