One camera offline, (-201) error

We have had a doorbell installed with no problem. I just bought the HomeBase 2 and 2 camera pack. Worked fine for a couple weeks now one camera, with a good signal, went offline. I can’t understand what the problem is. It has a good signal.

Why not buying HomeBase3 instead of 2?
If new return and get HB3.

You need feedback through app to Eufy.