Ring 2 goes offine consistently, can't reset - out of state

My Ring 2 doorbell consistently goes offline, leaving our home in Fl unprotected. We installed the solar charger which keeps our battery steadily above 90%. We have an older ring at our home here that has never gone offline w the same speed and company for wifi. I have had xfinity check our service and they show no breaks or cutoffs. The Ring came online as we pulled into the driveway last time w no other action, but I had a visitor push the doorbell earlier this month and it did not reset (this had worked before). The wifi has been in use while the Ring is offline. Very frustrated.