T-mobile Home Internet Wifi Hub loses internet frequently, not reliable.

I have been having exactly the same problem with the home Wi-Fi gateway. I have only been on T-Mobile for a few months. However I did cut the Comcast cable. I expect a stable Wi-Fi environment. I have done all of the troubleshooting requested by the experts including replacing the gateway and creating multiple SS IDs on the gateway. The problem still persists. I have also noticed that the technical support experts are no longer local they seem to be coming from OFF SHORE. Sometimes they are very difficult to understand. I am getting to the point where I am going to look for other Wi-Fi solutions . I am hoping that T-Mobile can actually address the problem which seems to be tower specific. I am in a position where I have two towers within a half a mile of the gateway. However they tell me that I keep connecting to one that is more than 5 miles away . When I ask why they say because the local towers are congested. I find it hard to believe that they are congested 24 hours a day seven days a week. I always have 3 or 4 bars - so the signal is strong!  T-Mobile needs to address this problem or they are going to lose customers and receive some bad press !