I reside in the heart of Chicago and have running into the same issues since the 17th.
I wanted to throw an update to anyone else having this issue.
I have been back and forth on the phone and chat with T-Mobile regarding the data issue and was informed that this has been an ongoing issue and that there is an engineering bug/ticket on the problem and they are addressing it as quickly as possible. They also stated that I will be reimbursed for the lost data time. I would recommend anyone else having the same issue to request the same.
As far as how quickly they are working to resolve the connection loss is anyones guess, especially since it has been going on for over a week.
To this moment I am still not able to access any applications. I can receive email fine, but as for everything else, its a no go.