Must be the complexity factor. The 7 series was redesigned this year, so maybe there is an improvement. Didn’t know about the series was problematic. I have a 5 series and love it. Yeah, I think the 3 series cars are pretty bullet-proof.
#'s are great, I'm on my 5th. 5's are even nicer.
Maybe it’s something like lack of shared parts and design? Says something that the 7 is worse than Jaguars or Rovers!