I use a SE HBH-660 BT headset and TT Navigator 5 (just upgraded) on SPCS ROM 1.12. Prior to the latest firmware upgrade (and while using Nav 4), while using both BT headset and GPS, a call would ring into my headset. Now, calls do not ring into the headset, and I have to answer the call with the phone itself--has anyone found a work around to have it function like it did previously (much more convenient)?