Those are the errors when UMA is out. You can call TMo and they'll work through to make sure you don't have any other problems. If UMA has been working fine until the last few days then I wouldn't worry too much until they get it fixed. http://www.blackberryforums.com/wifi...11-2007-a.html
Have you tried turning all connections off then turning back on under Manage Connections? It's working for me but it depends on your location, too. I don't think it's completely fixed yet.