5G home internet keeps dropping

I spent considerable time monitoring mine and researching. Do get into the web interface from a local client and record the internet connection information for the primary and secondary channels and record the channels recorded for the primary and secondary connections to the tower. The T-Mobile support engineers should be able to provide the coordinates for the tower where your connection is established. If you know how far you are from the tower(s) and what channels are used etc… that helps to have a better idea of what to expect. 

I would guess the primary will connect to LTE and the secondary channel should connect to 5G. Hopefully you have good signal strength and signal quality at least. It could be they are just doing work on the tower equipment and you have just encountered the disruptions due to that. I found the web interface to the router from a client can be impacted by my Bit Defender agent from time to time as the connection from the client to the router is not encrypted. That makes it appear as if there is no connection to the router even with a refresh so that was driving me nuts. I ran speed tests and also ran concurrent pings to several of the DNS servers to monitor how the connection was holding. You can rotate the router a bit and influence the signal strength. I was able to improve the 5G signal several dBm just by turning the router to position it so the 5G antennas were receiving the most favorable exposure to the tower. You have to know where the tower is to really get the router in the best location. Also make sure you dont have metal screens on the window in the way of the signal from the tower. 

I cannot say for sure about the relationship to heat as I cannot confirm any heat related problem with mine. I did put a fan under it today since I had a small spare laptop cooler. Some people appear to have had heat related problems and appear to have had positive results adding a fan for cooling. I put mine out in 88 degree temp last Sunday to test it for such but it ran fine for hours. It was a bit warmer than usual when I brought it in but it never dropped link while outside the door. I suspect the problems I have seen are more related to engineers working on the tower rather than this router. Good luck with it.