Some routers cause these problems, so even with the new phone, you'll probably have to upgrade the OS and/or do something about the router.
Types of routers that seemed to cause problems, at least on 4.2, were N routers, Fios Actiontec, some Belkins.
4.2.2.184 was a much better OS for UMA. I believe Tmobile stock OS is .180. The 4.5 versions seem to be more stable on N routers and others.
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