Good news after an update of the packages that included amd-graphics and adding the parameter amdgpu.sg_display=0 to grub. It works perfectly for now. I don’t know which of the two things has fixed the problem. But it may be related to this other one:
I leave this post here in case the same thing happens to anyone else.
** I apologize for the long response time, but for some reason I didn’t hit the reply button and it has been left as a draft all this time.