Cyanogenmod 13 - dropping T-Mobile connectivity

[littlenoodles]

Flashed CM13 last weekend. So far, so good, kinda. Except that at work, where I've had notoriously bad T-Mobile connectivity, it now is 'better, but flaky'. I seem to get a 4 bar signal, but it drops and reconnects constantly, which is doing bad things to my battery life. Am I supposed to have flashed some new radio firmware?