External Monitor Freeze

I have a Dell G16 7630.
For a few days, when I am using external monitors randomly they freeze. Only laptop monitor seems to work, but with some delay.
After restarting, both monitors restart to work… and then they freeze again…
I can not be able to know what is the reason…
I try to update driver version to 550, but with this version both monitor appear not to be connected… so I reverted on 535.

This is my bug report
nvidia-bug-report.log.gz (510.7 KB)