crashing during wave 10 ultimatum

usually, 1-2 out of every 20 maps crash on wave 10 of ultimatum encounters. I run dunes map. the game will lock up and crash, no spikes in connection, I also have a very high-end gaming PC. GPU drivers are up to date.

I have done this same farm for about 5 leagues now and have not encountered this problem before.

as a side request, if the system is able to sense a crash during an ultimatum encounter would it be possible for it to allow you to resume the encounter once reconnected? when running the inscription scarab, this issue has become costly.

at the very least, if the game senses a crash, it should drop the loot that was gained till that point.