Problem with T-Mobile Home Internet app

We still don't have a fix?  When i first got the Arcadyan the T-Mobile app worked wonderfully.  This was about a year ago.  Now I've noticed I cant do anything.  I can barely get into the app.  My main purpose of using the app is to manage the devices that are logged onto my network.  You can forget it. If I manage to get into the app itself I shouldn't even try to select the devices tab.  I will get the spinning gear "forever". Come on T-Mobile what are you'll doing.  What is the fix? Im on an Iphone XR with latest IOS.  Again this feature worked fine months ago.