5G home internet keeps dropping

The Nokia router has 4 U.FL connectors, one for each antenna. The U.FL connectors are small and making the connection takes great care. When seated properly there is a distinctive click feel as the U.FL connector seats. This is a mechanical connection. The location of these U.FL connectors in the router does not offer a huge amount of real estate so making these connections would take care and focus. Maybe some of these are not connected firmly. It would take 5-10 minutes to confirm this and it might explain signal connectivity issues if this were the case. It might be a long shot but maybe not. If the cellular statistics report packet errors or drops I would investigate this. The guide waveform has is excellent so checking this is super easy. One point I would like to clarify is that IF you ever need to remove the SIM be sure to have the router horizontal with the SIM card holder so that the retention screw is to the right of the SIM when removing the SIM. There is nothing holding the SIM in the holder so if it is in a vertical position when the SIM tray is removed the SIM will fall out of the SIM tray. Just pay close attention to details as progress is made. If the U.FL connectors are checked and they look to be seated properly I would not disconnect them as they are rather delicate but careful examination would not hurt anything. Removal of the shell of the can is easy. Just take a look at the guide and read each step. If you don't feel comfortable doing so or don't have the tools that is fine. Getting a replacement router might be possible, in time, but also offers the possibility of introducing new variables. 

Link to waveform guide: t-mobile-5g-gateway