I have the exact same problem and had to reinstall the game and verify its caches. Still nothing!
Crashes after few minutes and is completely random - either on menu, logging into server or just looking for one.
Really frustrating and very tempted to get a refund after trying for 48hrs.
Unreal Engine is exiting due to D3D device being lost (Error: 0x887A0006 - ‘HUNG’)
Funny thing is: i can play it if i lower the settings to medium, anything on ultra will crash it even though i have more than the system specs to run it… odd