5G home internet keeps dropping

I don't know the answer to that. I spoke to probably 3-4 different technicians before we straightened it out. I was told at one point the new 5G gateway was essentially a dual antenna and could receive either a 4G LTE signal or 5G signal. I was also told the gateway looked for,  an attached to wherever it received the best signal. So you would assume if there wasn't a good 5G signal it would grab a 4G signal.  In our case it didn't work at all. It was my suggestion since we hadn't returned the 4G LTE receiver to reactivate it and give it a try. The tech agreed and after we hooked it back up it worked fine so I stayed with the 4G LTE receiver and sent the 5G back. There seems to be 2 possibilities: 1) The new 5G gateways are not capable of receiving the 4G signal and 2) T-Mobile is putting the 5G gateways out in the market where towers are not yet broadcasting that signal. That's the only explanation I can come up with for our experience.