sagemcom fast 5688w internet going out or losing connection

Update…

My connection dropped for the first time today (Dec 14), so it appears the signal refresh and SIM/IMEI confirmations performed by the CSR last night did not help. I decided to try a different approach with this drop:

• Opened the app on my phone and checked advanced cellular metrics located under the More menu item. The 5G metrics (RSRQ, RSRP, and SINR) were dashed (zeroed) out as I would expect since the 5688 gateway dropped the signal. However, the LTE metrics were still showing, even after tapping each value and refreshing the page. This suggests that the drop was isolated to the 5G signal, and it seems odd that the internet connection would go down considering an LTE signal was being received. Shouldn't LTE be the fallback if the 5G signal drops, thereby preserving internet service albeit at a slower bandwidth?
• Instead of restarting the gateway, I waited to see if it would reacquire the signal. After ten minutes, it did. The next drop could take less or more time to reacquire a signal if at all, so I don't consider ten a magic number. The fact that a drop occurs is unacceptable, but at least it appears the gateway is capable of reacquiring the signal without a restart.

I called customer support yet again (the fourth T-M rep I've spoken to in the past 24 hours), and aside from creating another ticket and escalating the matter to "engineering", the only new information shared was that the tower was undergoing some maintenance. Considering she was working off a script and troubleshooting manual, my confidence in her explanation is quite low. She offered no explanation for the LTE metrics showing despite the 5G signal being down. I asked to speak to a supervisor and was told one was not available.