Ring doorbell pro will not connect to wifi

I purchased my Ring doorbell pro in December 2019, along with the home security system. The doorbell worked great for a few months, but in March 2020, it lost wifi connectivity. The rest of my Ring security system has no issues connecting to my wifi. I have been in contact with Ring support several times. They've had me try everything from resetting my router, resetting power, taking pictures of the doorbell, chime and transformer (to verify power requirements), and even bypassing the doorbell chime. They eventually sent me another Ring doorbell pro, but the new one will not connect to my wifi either. I started researching wifi settings and issues with the Ring doorbell pro. I have set my 2.4 GHz channel (on my Linksys dual band router) to 1, as recommended in one post I saw. I'm running out of ideas and patience. Any suggestions?