@Solla-topee it's a bit too early to conclude that the problem is solved, but so far it's looking good. I use a 4G-router (it is in my cabin), brand ZTE MF 286D. Single mesh? That's Greek to me...

@Kel Thanks for your advice! I turned off the 5ghz on my router, and now it has been somewhat stable for almost a fortnight. But I'm not verysatisfied with the fact that I can't use my 5ghz any...

I have the same problem. Everything worked fine until I installed a memory card! The camera is placed in my cabin 250 km from home, so it is not that easy to reboot every time it happens.