This problem has been driving my craze for a long time. Every week, the doorbell disconnected and people were standing outside thinking I wasn’t home.
Finally I was able to get it 99% stable. I installed a wifi analyzer app on my smartphone, which showed that there was an overlap between the wifi channels in the 2,4 GHz band used in my home and the doorbell. Unfortunately, there is no way to change the channel in the doorbell, so it looked unsolvable.
But then I decided to move all large bandwidth consumers in the home (PCs, smartphones) to the 5 GHz band, which was also supported by our wifi router, leaving the 2,4 GHz band almost free for the doorbell and a few other devices that didn’t support 5 GHz.
I also configured my router to only accept 2,4 GHz connections via the 802.11"g" and “n” standard, and not the slower “b” standard, which would downgrade the performance in the whole network.
In the 4 months since I did that, I only experienced 1 disconnect. Still not perfect, but certainly acceptable.
I think Eufy made some bad design choices on the wireless part (of the doorbell, because another Eufy camera on the same network never disconnected), but at least this is a workaround.