Massive lag when trying to ctrl click into stash

Whenever I try to ctrl+click items into my stash, I'm getting a massive lag spike, from 1s to 30-60s in extreme cases which results in a DC. It seems to vary for different item types, seems to be the worst for various fragments and currency. I've tried switching to to a different realm, tried in London and Frankfurt and the issue persisted in both.

Today it happened for the second time this league (played for 2 weeks only) and persists for multiple hours.

Last time the issue eventually went away.

Bug report reference number 2,149,789,534.