BB Bold :: Unstable WiFi/UMA/WiFi Calling Connections On It?

I literally drop EVERY WiFi call after about 5-7 minutes. I get an error message "WiFi Signal Lost". I would normally just blame the WiFi network I'm on, but it does it on multiple totally different networks (home, work, Burger King, etc...). And I know for sure both home and work networks are very stable and fast. Not sure what the issue is. If I go and view the network details of the network I'm on, the signal strength is typically between -40 and -75 dBm. While in UMA mode, the phone will actually go out of UMA mode sometimes for no apparent reason, and won't go back into UMA mode until after a few minutes. The worst part is that the Home screen says I'm still connected to the WiFi network, but the top right corner doesn't say UMA! It says 3G! And YES, my Mobile Network Mode is set to "WiFi Preferred". Even if I set it to WiFi Only, the top of the Home screen says I'm connected to the WiFi network, but the top right corner says OFF and the phone just goes dead!!

I use this phone for work and it needs to be reliable. Is my above WiFi Calling experience normal?? If not, does anybody know anything I can try? Are there some apps that conflict the with operation of the phone portion at all? I'm back to using the default theme now and it's still doing it... Should I try doing a factory reset? Here are the apps I can think of that I have installed:

Dark GalaxyCrunchSMSBolt Browser w/BBLauncher PluginQuickPullGoogleMapsWeather ChannelTetris by Electronic Arts I've removed a bunch of the default apps, but all other apps on the phone are ones that it came with.Another thing I've been noticing... it will randomly lock up for a few seconds and be TOTALLY unresponsive. If I'm scrolling through a page, the pointer will all of a sudden stop and become completely unresponsive for a few seconds. Then resumes like nothing happened. And, if I'm typing a long text or email and it does this total-lock up, I'll look up from the keyboard and see that none of my keystrokes were being echo'd onto the screen while it was locked up. But then it starts working again like nothing happened. BUT The strange thing is that if I'm typing while it's locked up, it doesn't appear to a buffer any of my keystrokes! (as opposed to on my old BB 8330: sometimes when it got bogged down because I had too much stuff running in the background, the keystrokes being echo'ed to the screen would sometimes slow down and lag behind my typing.... but it always kept track of what I typed and would eventually catch up.) HOWEVER, when my 9780 completely locks up like I mentioned above, it doesn't seem to recognize that I typed anything while it was locked up. when it "snaps out of it" and comes back to life, none of the keystrokes I typed while it was locked up are echo'ed onto the screen. I'm wondering if it's during these complete lockups that I'm dropping calls?

Running 6.0 Bundle 1879 (v6.0.0.448, Platform 6.5.0.136)