Thanks already for your reaction!
In the meantime I have found out that it is impossible to get into the BM5 bios with two screens attached - which was my case with the BS5 plus also my BV10 connected via DVI-I. No matter how many times I retried, the red dot kept blinking forever. But as soon as I had disconnected the BV10, I got into the bios right away (pressing Esc immediately after applying power)!
Once I was in the Service Menu I experienced a 'runtime exception' followed by a system crash and after the next restart the temperature of the BM5 case indicated 0°. I could repair this by applying a 'repair' of the Beomaster5.exe program.
For the moment my BeoMaster5 behaves pretty normal again, restarts succeed again most of the time. But I will purchase a replacement SSD anyway, to be more secure.
For the moment I am also struggling with the updating of the N.RADIO stations. My BS5 indicates that the latest update was on 2020-02-13 - which corresponds with the numbers downloaded from the portal as reported in the RadioPopulator.log file (in the BM-Share/Log folder). On this date I have changed to a new computer on which I didn't reinstall BeoConnect (without realizing the impact of the 'no registration'...). Do you really receive N.RADIO updates until today - do you indeed see updates reported in your RadioPopulator.log?
I have reported this issue to B&O yesterday and I already received the answer that the issue was escalated to the technical department... so that is better than nothing and I am very curious to see if we will learn something more about this updating mystery :)
I'll keep you informed!
Luc