Unable to connect to RingRin

Hardwired Ring Video Doorbell Pro Worked perfectly for about 3 months, then always "offline." Too busy with work (I travel) to try to fix until now. Bought a WiFi Range Extender thinking that would be the problem, but using the Ring app and following Ring directions to "reconnect to wifi" in order to connect to range expander Ring App says it will create a temp network called "Ring" and I should connect to it on my iPhone. However it won't connect after many repeated attempts standing right in front of the doorbell which does have the swirling white light after pushing the orange reset button. Tried toggling wifi on my iPhone a couple of times. Consistently returns the error msg "Unable to connect to RingRin" after trying for a few seconds and now I'm at a dead end. Seems like I've pinned this problem directly on the Ring video doorbell but where to go from here?