Network concerns with replacement Ring Doorbell

I have the same issue. My first Ring doorbell we stable for 6 years. About 4 months ago, I had network issues. They suggested me buying a new unit. Worked for 2 day and network issues. They replaced my model and network issues with the 3rd unit. Wifi is strong to doorbell, both floodlights are much further and never drop. Power is 21.1 volts consistent. Not sure what else to do.