I feel your frustration, especially since Wi-Fi connectivity issues can be tricky to troubleshoot. That’s another reason I suggest investigating the power:
- If you can determine that there is a power issue and solve that, then that may resolve the connectivity problem.
- If you determine that power is sufficient and can be ruled out as a cause of the problem, then you know you can shift focus to the Wi-Fi itself.
- If you ignore power as a possible contributor to the problem and start doing things to your Wi-Fi, then you could still potentially have an issue with power but not be aware of it.
It might not be a power thing in your case, but that’s something I’d want to rule in or out, because those kinds of issues are often more straightforward than troubleshooting the Wi-Fi.
Having said all that, I commented on my own use of a range extender in another topic earlier today:
I don’t know what kind of range extender you’re using or how you have it configured, but if you have mixed-mode WPA3/WPA2 enabled for security, then I’d try setting it to WPA2 only to see if that improves your performance. If you have easy access to your doorbell’s transformer and can see its rating and measure its voltage at the transformer, then I’d still do that, too.