As an update for those with similar problems. I spent an hour working with a tech support person from Ring. They were helpful and we tested various Internet connectivity scenarios, I sent pictures of my installation, etc. They made comments like “you need to get a professional electrician out to check your transformer,” BUT at the end of the back and forth they sent me a replacement device. I installed the device and all is well again.
Again, my device had been working for 9+months before it stopped connecting. It would be helpful for Ring to have better on device diagnostics for situations like this rather than blaming the guage of my electrical wire, the transformer voltage, etc…