By reading the response from my 1st thread about this, it's clear that this is an issue that many people are having.

UMA stays connected and than after a while kicks back to EDGE.

If everyone will call T-Mobile Tech support to report this issue, they will fix it faster. I know it's a pain in the rump, but worth it.

FYI -
--our router stays connected to internet perfectly- no drops.
--we're using T-mobile Linksys router.
--we can reconnect to UMA by following procedure.
1. go into "Manage Connections"
2. un-check Wi-Fi connection
3. re-check Wi-Fi connection - after few seconds UMA reconnects!

Upgraded OS to 4.2.2.175.

Works ok now.

Great. Next time, please keep it in one thread. As in Part 1.

Thanks.