Connection Timeouts

When I purchased my Ring doorbell late last year, it came with an Echo Show 5 as a free gift. Originally, it would maintain a 5-10 minute video connection with the doorbell, but now it consistently times out at 100 seconds -- which makes it almost unusable for my application. My iPhone holds the video connection for exactly 10 minutes before disconnecting. Why would one device stay connected longer than the other? Both are on the same WiFi network sharing the same SSID. The backend infrastructure is the same for both devices. This is not a signal issue; the router is 10 feet from both devices.