I have just got a 420d (UK) and when my blackberry Z10 is connected and I am using Bluetooth it resets every 10 mins, tried my iPhone and it was fine for three hours straight.
Definelty the blackberry software crashing it, I did notice that there were some tutorials on my BB when I turned it on this morning so the software must have updated recently.
I'll take it in tomorrow as I assume it's a recent issue and maybe a few people have experienced it with blackberry being a popular business handset along with the BMWs themselves, frustrating one though.
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