Hi,
Try updating Direct x if there is an update.. Also make sure Visual C is up to date..
Verify steam files: From the 'Library' section, right-click on the game and select 'Properties' from the menu. - Select the 'Local Files' tab and click the 'Verify Integrity of Game Files' button. - Steam will verify the game's files - this process may take several minutes.
I wouldn't think so, but the minimum PSU is 850w for the RX 6900 XT.. Maybe you get a spike and it hits the limit?
Look at this link too: [Solved] Unreal Engine is exiting due to D3D device being lost - Driver Easy
AMD Ryzen 7 3700x, Asus Tuf Gaming RX 6700 XT, Asus TUF Gaming x570 Plus, 32gb G.Skill TZ neo 3600mhz, Samsung 980pro 1tb NVME, Samsung 970 EVO Plus 1tb NVME, Lian Li Galahad AIO 240mm, Antec Titanium 1kw.