Crashes and not working properly

Hi, Davinci Resolve 16 is not working properly with my new RTX 3070. I bought it at launch and since day 1 I had problems. The main issue was that when exporting a video the graphics card only got at like 8%-10% usage and the processor had to do the rest. That meant slower video rendering and a lot of unnecessary pressure to my processor. I kinda wanted to solve that but I found nothing so If someone could help it would be nice. Another issue I have more recently is that Davinci just crashes out of nowere. So I opened the task manager waiting for a crash to occur and I realised that my "gpu 3d" suddently spiked to 100% usage and eventually Davinci crashed. I reinstalled it, installed Davinci Resolve 17, reinstalled graphics card drivers. And nothing. I even did a full format of the PC back when I had the exporting problem and it didnt work. I dont think that formating again would be useful when it comes to the new crashes. I searched it and I found some forums talking about the 100% suage in gpu 3d. Some other people have gotten it but nobody knows why it happens or how to fix it. So I can't edit anymore without saving every second knowing it might crash and lose like a minute everytime, and also when exporting it doesnt use the gpu properly. I never touch any settings so idk what's going on. I used to have the same pc components and a GTX 1050 ti and everything worked properly. But with the RTX 3070 I have this issue. In all other games and apps everything works just fine. Even in premiere. I really don't know what to do.

Thanks for reading.

Maybe this?

viewtopic.php?f=36&t=131254

Also, only Studio will utilize the GPU for decoding and encoding. The Free version uses only the CPU.