[Airz]

I suggested a MAF issue due to the odd readings and the fact it's easy to try cleaning them but I wouldn't go out a spend a ton of money on new MAFs without being sure it's actually those causing the fault.
Do you have any independent BMW specialists you could take it to so they can run proper diagnostics on it?

You could also try sending the logs to protuningfreaks as it's their OTS tune and they may have seen this sort of thing before.