As an engineer, I think it is far more likely that a bit of after market software is responsible than the heavily and methodically tested original equipment. Sounds like whatever version of Dinan you had isn't compatible with your car's software versions.
What are Dinan saying about all this? Presumably they are being the super helpful company everyone says they are?
Don't forget PUMA is BMW AG taking control from the dealer, and they want to know everything that is wrong with their cars. They aren't going to leave things unresolved.
Keep us posted. I'm very curious......
I too am an engineer. Also held a P.E. license. I would agree with your first observation but for the following facts:
(1) F10 ran perfectly for 2 1/2 years with the original Dinantronics module and BMW initially pointed the finger at being the culprit. They updated the Dinan firmware & software and ICM software and pronounced it as being fixed. It wasn't.
(2) Back to BMW of Manhattan for a 2nd service appointment and this time replaced the entire Dinantronics unit with a brand new one from Dinan and once again declared the F10 as fixed. It was not.
(3) Took the F10 to George Boutsikos at M-Chanics to get another opinion. He completely disconnected Dinantronics, connected a laptop with Rheingold BMW diagnostic software to the F10 & we then proceeded to road test it for 3+ hours on the Southern State Parkway at highway speeds.
(4) This is what we observed. Upon initiating a manual down shift the DCT would rev match and engine braking began, but after about 1 second the clutches inexplicably released and engine braking ceased. A scary scenario when you are trying to scrub speed. This scenario was repeated many more times. And Dinantronics was completely disconnected.
(5) F10 also has a nasty habit of maintaining speed on the highway after you remove your foot off the gas pedal. Probably related to the DCT clutches releasing prematurely.
(6) Dinan has maintained their innocence from the get go. And what are the chances of the new Dinantronics module instantly failing and causing the same DCT problems? Infinitesimally small I should think.o
(7) George has been in contact with BMW of Manhattan to confirm his findingsi.
(8) I'm hoping against hope that we'll learn something from PUMA, but I am not optimistic. Only 3 months left on lease.
(9) the Better Business Bureau of NJ rates BMW of NA as "F" on a scale of A+ to F.
(10) Profits are clearly more important to BMW than transparency and customer satisfaction.