Constant crashing, can't run map for over 5 minutes

Also, I get no error msgs at all. and in Vulkan my VRAM bar is full all the time and has been since I went over to it from DX11

OK just ran mines level one off of Highgate and no crash, I had previously crashed on this level at least 6 times, never completing it..
DX11 on and NO multithreadiong. I restarted the before as well and it seems to run smooth...
Cheers.

Running 20 minutes as above and no problems so far.

A good run then at the 40 minute mark Bang! Freeze but when I finished a 4th Archi enemy and a new Orb dropped for me with the whole sound and marking on the screen and overlay map. Had to go back to Highgate and speed run through the 2 previous levels and The Crystal caves were just as I left then!!!

And once again after another 40 minutes... watched the latency graph go off the chart then the game crashed.