I've been running OS 5 for a while on my TMO 8900 and like it (aside from from my issue with the media player and notifications which I asked about in another thread).

However, UMA has gone to hell on every version of OS 5.0 I have had (including the latest release). When I ran my TMO authorized release (4 something, it was a while ago) it was flawless but now I get breakups during calls, unsent SMS texts... basically I only use it if there is no cell reception at all whereas before I used UMA whenever I could.

I don't see many complaints regarding UMA on the various 5.0 releases but if there are optimizations I could try or TMO specific settings that might get me back the UMA I used to love, I would really appreciate it.