T18 full pack size crashes

Honestly, this is getting out of hand.
I’ve been running T18 full pack size maps with my group (6 players), and it happens way too often that the map just crashes mid-run.

Every single time, the same thing happens:

Everyone in the party gets instantly disconnected

The map is completely lost

All items in our inventories are deleted

And we get hit with a full rollback, including XP

Tonight alone, out of 10 maps we ran, 3 crashed exactly the same way.
And when you see what we’re losing, it’s just unacceptable. Each map setup costs around 12 Divines each (or several hours of crafting the map), and on the last crash we literally lost two exceptional bases worth around 600 Divines total.
All gone. Nothing recovered. Just a main menu screen and a strong urge to uninstall.

I love PoE2, but these crashes completely kill the motivation to push endgame.
Anyone else experiencing the same thing? Have you found any kind of fix, or is it just a T18 roulette at this point?