I believe it's TSB 15-194-16R
Fujitsu 10/ FTEN/ F10 Navigation Voice Guidance Instructions Getting Cut Off
This bulletin announces availability of an enhanced audio system power amplifier (amp) which contains software to address customer concerns of voice guidance instructions (words) being cut short or cut off. For example: instead of the instruction saying “Turn right ahead”, it might be “right ahead” or even just “ahead”. This intermittent condition occurs after completing a Bluetooth hands-free phone call while using the navigation system’s voice guidance feature.
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15-194-16
15-194-16R