There's a laggy server instance on EU right now

Every couple of games i create\join i get awful ping. Normally it’s 30-60, every once in a while it says 100-200 but feels like 300. Inventory’s laggy, can’t teleport at all. Making a new game usually fixes it.

You are probably flipflopping between the two different region IPs. There’s probably some sort of routing issue going on between your ISP and one of the two region IPs. You can use WinMTR to see where the problem might be.

Diablo II: Resurrected server IPs:

Region IP Address 2nd IP Address
North America 137.221.106.88 137.221.106.188
Europe 37.244.28.80 37.244.28.180
Asia 117.52.35.79 117.52.35.179

WinMTR has a log export function, which you could include with an email to your ISP’s support. They may be able to forward the information to whatever internet hop is having trouble.