My Q and T-Mobile internet $#!%$

We got the t-mobile internet about a month ago. All our devices are connecting to it EXCEPT the Chamberlain My Q. (Actually, it connected, worked for a couple days, disconnected, connected for a few more days, disconnected, now nothing). After about an hour and 2 phone calls with Chamberlain, when they asked about my router and I told them t-mobile, their response was, "Oh." So, they sent am email with a list of things to check with t-mobile.

On with T-mobile for about 30 minutes, the tech couldn't help me, spoke with his supervisor, and came back with, "well, there's nothing we can do. Talk to the manufacturer." I told him that this is not an unknown issue, I am not the first person to have this, nor will I be the last. There are posts going back 4 years and they should know a fix by now!

Enough of the finger-pointing! I need a solution! Anyone...anyone???