I think I found the problem. I think it misbehaved because of an illegal character in the "HOSTNAME". Changed the hostname yesterday and It was still alive this morning even if I have not pinged it.
@Ikes-72000 If it were me having these problems, I'd simplify the situation by demounting the nRF board fromt he D1 Mini, then I'd power it, hook it up to a console and see whether I'm getting the count that it should be outputting. At that point what you have is simply a breakout board for the nRF, and it doesn't get any simpler than that.
