Having Problem with lagging

I am from SEA region and I played in ocean server . everything is ok but
I am having lag lately. Today we are on raid and once boss fight started suddenly
Latency jump to over 4000 ms . Me and my brother both having this issue.He play from thailand and I am from Myanmar . We both are in SEA REGION.I asked if somebody having this kind of issue in trade chat . Some said they having same issue from SEA Region.Is there anything u guys can help me ? Please let me know.

Hey, Syvlannas! There’s a thread here with similar reports for the SEA/Oceanic servers. We’d like to try and track down if there may be a connectivity, server, or common addon causing the spikes.