sagemcom fast 5688w internet going out or losing connection

I've read other threads about the rebooting issue described by KimoWrex. It's unclear if this problem and connection drops occur mostly with the Sagemcom Fast 5688W, but I experienced drops with the Nokia. Update from my last post:

• Three 5688 drops yesterday (Dec 15), bringing the total to 11 this week (1 Dec 11, 1 Dec 12, 4 Dec 13, 2 Dec 14, 3 Dec 15).
• Called customer support immediately after the second drop and asked the rep to check diagnostics while the connection was down. Also noted the LTE signal was returning values while the 5G was dashed out (in the app, More > Advanced Cellular Metrics). She suggested the drop was due to "tower maintenance", a reason given during previous calls to support. She could not explain why said maintenance was causing the drop.
• She suggested 1) moving the gateway to a new location and 2) separating the bands on the gateway, implying that a 2.4 GHz network connection could tap into the LTE signal since it was still active (during the period when the 5G signal was down). Ended call.
• Moved the gateway to a new location despite the app’s placement assistant indicating the previous position was optimal.
• Separated the frequency bands by creating a second network. In the app, Network > select current network > change frequency band from Automatic to 5 GHz and follow the provided restart steps > once restarted, select Network again > select the purple and white plus sign > create a network name and password > change frequency band from Automatic to 2.4 GHz and follow provided restart steps.
• Immediately after the third drop, selected the newly-created 2.4 GHz network on a laptop, hoping it would pick up the LTE signal during the 5G drop (as explained in the second point above). Nothing. Zero connection. Profanity. Frustration.

I have now exhausted all remedies after three gateways, 11 connection drops in five days, colourful language, SIM and IMEI confirmations, signal refreshes, expletives, gateway repositioning, frequency band separation, irritation and profanity, and imagined NASA-approved protocols. The only reason for the drops I've received is tower maintenance, and when I asked the rep for a completion date of said maintenance, she didn't know. Tremendous. While I can't verify this, I've read other threads that, when combined with statements by the reps I've spoken to this week, suggest that network congestion is the issue. When this occurs, phone connections are prioritized over home internet bandwidth. Again, I can't verify this, but it seems logical.

Conclusion in my case: T-Mobile 5G Home Internet is outstanding… when it works. 300+ Mbps download… when it works. Convenience and ease of use… when it works. When it doesn't, you're on your own. I will now look for a new provider and hope that anyone reading my posts has a better outcome than I have. Happy Holidays.