Calls drop on WLAN UMA home net -8120 Pearl

Since I have had this phone 4/08, maintaining UMA connections has been poor.  Calls often switch from UMA to TMO mobile net during calls.  I think it happens when not on calls too, but I'm not looking at phone when not in use.
I've verified phone is set up to optimal with TMO support, checked WLAN AP/router too, followed BB Tech Sol. Center recommendations for supporting voice on WLAN APs.
Seems to me that received signal on Pearl is weak even when within 10 ft of AP (-40DBi).  When moving around my little house, signal is usually down around 70-80DBi.
What else am I missing?
Is the Pearl antenna inherently weak?
Is there a way to boost antenna power on the phone?

Its not my intention to resurrect dead threads but I just had this very same issue with my 8120 and Rogers in Canada. I thought I would share my solution as I came upon this thread while looking for a solution.
UMA is a service that functions like voip. Therefore it requires three things: (1) a client - in this case your phone (2) connectivity - in the form of wifi internet access and (3) a server - it is not automatic, your phone number has to have the UMA service added to your account with the cellular provider in order for you to connect to their server. And if their server has an issue you will fail to connect through UMA.
So if your phone is functioning and can browse the internet through wifi then you have satisfied 2 of the 3 requirements.
To test this I used the "Manage Connections" icon to turn off my mobile network. Then I verified that I could browse the internet through wifi and send and receive email but I could not make calls. In my case that just left the phone company.
SO I called Rogers and bitched them out that my UMA stopped working and had them monkey around with the account settings until UMA came back on. Problem fixed.

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