NVIDIA does not find the GPU after a short period post reboot (Ubuntu 18)

Hi there,

I have a ZBook-Firefly-14-G7 on which I installed Ubuntu 18.
Graphics is Intel® UHD Graphics (CML GT2) and there is also a Quadro P520 available.

When the Nvidia X server is set to the Performance Mode then after a few minutes the system freezes and I have to reboot. When I changed to Power Saving Mode, I solved the issue of freezing but then GPU becomes inaccessible after a few minutes.

Is there any solution for this?
Cheers,
Jacob

nvidia-bug-report.log.gz (441.0 KB)