This started happening to me too, the crashing mentioned here is exactly what has started happening to me over the last week. It's become more common now and it's happening increasingly more frequent, it seems to be ever since the hotfix for 4.45.

To outline what happened on my end :

i've tried dx9 and dx11 mode. Same result, i might get a few minutes of pretty solid time to do some things, but others i won't.

Those same error boxes popped up a few times and other times it'll just crash to desktop for no reason. It's happening when i teleport, join instances and even when leaving an instance. Or just seconds after logging in. Other times, it won't even load the world up and was spitting out those Dx errors.

I've used Ccleaner, rolled back graphics drivers, updated graphics drivers, Not too long ago i upgraded to an SSD and re-downloaded the game. Fresh windows 10 as well, So that probably isn't what's up.

Strange that others are getting the same problem. Doesn't seem to be on our end at all :/