This morning (sometime between 7 - 9 AM) after a year of using my T-Mobile 5g home service, my laptop stopped connecting to the internet. It still saw the TM 5g device, but when it connected, there was no internet. I have a wifi transmitter attached to the TM device and my laptop was seeing the internet thru that. My work laptop was connected to the TM 5g device and accessing the internet without a problem. I saw someone mentioning that 2.4 ghz devices might have trouble accessing the TM Device depending on how the network was set up. The network was already set up to accept both 5 & 2.4 ghz. But I added a second network to my device that was 2.4 ghz only and suddenly my laptop was accessing the internet again. The big difference between the 2 laptops attaching to the different networks is speed. The 2.4 ghz is showing 57.4 Mbps (not bad) and the 5.0 ghz network is showing an incredible 346.1 Mbps.
So if you are suddenly not connecting to the internet, try setting up a 2.4 ghz only network from your TM device and see if that helps.