WotLK Crashes after flight @ Flight Master

[trackm3]

My game crashes during flights (Flight master routes, 99% of cases) or just randomly. The error states something about lack of memory resources.

I'm running the game on Windows 10 x64, version 1809. Also, I have 16 GB of RAM. The WoW client i'm using is the one with old models.

From what i recall, the game executable is 32 bit, does it matter in this case? And how to fix this issue?


Also, sometimes, my UI completely disappears. Along with my character. I found this happening randomly in icecrown when messing with my camera.

[trackm3]

Deleted cache. This still happens, but more rarely.
Any permanent fix?