T-Mobile, Please read this! High Speed Gateway Problems!

I had the original LTE Gateway and it was decent. Upgraded to the High Speed Gateway and even though my speeds and general connectivity are better, there is something seriously wrong with the Home Internet Service. Why are a lot of the settings and features that were in the original Gateway not available on the new 5G Gateway? My biggest issue is the fact that my Google Home Devices do not want to connect or stay connected once they are! I only have a Mini, Insignia speaker, Lenovo clock, Google TV, and one smart bulb. A lot of the time, the devices show connected but don't work. It takes a lot of effort to even get them all connected. I've even tried changing the security to WPA/WPA2 + TKP (SP?) as recommended for older devices that may not see your network. All my devices see the network and even connect but there is a major issue with the Gateway or Home Internet service that won't allow them to connect properly or stay connected. Very disappointed and this is a first for me feeling this way about T-Mobile. I had much better service with the old Gateway and tempted to keep it and return the new one even though I have better speeds and 5G. I might as well use my phone unlimited hotspot or my tablet which I've used as hotspot and never had issues with using my devices with it. Expected way better than this. I understand there are limitations compared to regular wifi service but not this. Basic settings and features are not enabled for some reason, yet they were on the old Gateway. That's my rant. I'll be reaching out to them but felt the need to post here and look for some help or answers.