Orbi RBS850 stuck on solid blue

Today I saw something I never saw before - from early this morning, about 6 am, until 11am, one of my 2 RBS850's showed solid blue the whole time. Everything else on the network looked fine - logs ok, performance ok, etc...just sitting on blue like it does for 5 minutes or so on a restart. I found this is an old problem that may still happen from time to time:

https://community.netgear.com/t5/Orbi/Orbi-satellite-stuck-on-solid-blue/td-p/1349539 

I read that the problem seemed to go away with a power cycle, which I did, and it's been fine for about 2 hours now. Also, like others, I had no 2.4GHz devices connected.

(As an aside, I do have a Logitech remote hub about 10 feet from the RBS that connects at 2.4GHz, but it always seems to connect to the RBR850 down in the basement - I have assumed that the signal is strong enough there for a 2.4GHz device that it never needed to switch to the closer satellite, and it works fine, so I never worried about it.)

Hopefully the solid blue light doesn't come back, it's really annoying in a dining room to see that bright blue light! I am posting as well so people know this problem is still in the firmware somewhere...