This has been a problem that's popped up several times over a few months but it seems to have gotten worse over time. When dismounting, especially when in a group, the game will run fine them immediately crash to desktop upon dismounting.

Before, this was mostly a problem just for me, but over time its gotten worse and spread, where if myself or another party member dismounts, our whole party crashes out of the game. There's no specific area or other conditions to note that this has happened under, it pops up at random. Usually its when I dismount, but I've had it happen where someone else in group dismounted as well and a whole bunch of us crashed at once.