Addendum: The fix is to install nvidia-driver 460.27.04-1 No freezes happened since then: system boot 5.10.x Fri Jan 8 15:20 still running
Cheers Seegras -- "Those who give up essential liberties for temporary safety deserve neither liberty nor safety." -- Benjamin Franklin "It's also true that those who would give up privacy for security are likely to end up with neither." -- Bruce Schneier