Killcrap - thanks for the response.

I have ULF in the E46 and a TCU in the E83. They have both worked fine with about 3 generations of HTC / MS Mobile PDA cell phones.

I see the definition:

TCU = Assist Telematics + Bluetooth + Voice Activation
ULF = Bluetooth + Voice Activation

I am aware that RF units get warm...but wouldn't a "lock up" of a TCU (and it getting warmer) be more related to a SW issue affecting the HW design of said unit?

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E83 - Aero PKG Mods installed: Homelink mirror. CIS-IBUS video module, AUX, Rr Dr Release, stock wheels, Remote start, CarPC (Atom) & mud flaps - NAV - MKIV - NA Map DVD - 2011
E46 - 18.5 wheels/tires (summer), 17 stock (winter), Homelink, NAV software upgrade, BMW video module, Radio to V53, AUX, USB IBUS interface,BMW alarm install, CarPC(Epia), remote starter, tank battery & angel eyes. NAV - MKIII - NA Map CD - High Version 2008.1