I have a 5 series 2005 model, it went back to BMW for a recall for the battery cable, once i had my car back it was cutting out when driving, i can be doing 70mph and everything goes all electrics, gave it back to bmw and they said its a glow plug fault and relay, which would only pre-heat to start the vehicle, but that is what they put it down to and didnt want no further involvement, still to this day it still cuts out.