Huge problem with ocean map

Just done a ocean map.
Set up the bombs.
Half way through (with huge FPS drop from 140 to spike as low as 40 fps with RTX3090), I got booted out to the login screen with a wonderful "unexpected error, disconnected". Lost my map with the loot on it.

This season is too buggy and so frustration. I waited months for that, insanely frustrating.

And I can't redo the map, it's validated (green). So happy right now.