Internet drops

My spouse and I both work from home, and we are experiencing numerous intermittent internet drops. 

Our router/modem has been replaced multiple times over the past few months. When the internet drops, it affects all devices- phone, streaming tv, computer connectivity, everything. When it drops, we can still 'see' our local network (the 'baseball' diamond) and we will often get the error message stating "The Wi-Fi network <name of our home network> does not appear to be connected to the Internet." 

When we lose the Internet, it typically recovers quickly, but it can drop out six times in an hour. If you're doing Zoom/Teams calls and talking to customers or doing product demonstrations, it is extremely frustrating and makes my business look bad to my customer. This adversely affects MY business. 

Reliability is extremely important to me and my business. When we first started using Xfinity for Internet it was very reliable and predictable, but over the past months this has become an untenable situation. 

We had an Xfinity supervisor come out one time and he replaced the modem/router and told us that it's an equipment issue. That many of the modem/routers get recycled, but during the recycling process they're tested and if they don't immediately fail they go back into the inventory. He tried three different modem/routers before we settled on the one to use. That worked fine for a few weeks, but then started failing and was replaced (once again) two weeks ago. This most recent modem/router is now failing on a regular basis and we are back in the same situation.