I have noticed this too... it also takes longer to connect to the car after the most recent firmware update to the X. I have an app called "Bluetooth Notifier" that makes sounds when connected/disconnected from the car... and sometimes I hear it disconn/conn while I am driving. Never done it in a call tho.
I have not noticed this issue. I make a 45 minute drive (one way) to and from work and I am constantly on the phone. The only thing that I notice is the dead spot in a couple mile stretch. I have an 2009 Toyota Camry Hybrid with factory BT.
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