Wow, someone else has the same problem as mine, same model and year, AUS build. Car would drop 10kph, didn't matter if cruise was on or not. Applying power wouldn't 'snap it out of it'
Dealers couldn't fault the damn thing when I left it with them. They had it for days. It's at it's worst when it's heavy rain, light rain not so much of an issue. Took service guys for a drive also, they couldn't feel anything but it wouldn't repeat / rain enough. Sports displays did show fluctuations.
I also had very noisy breaks, particularly on release from a stop and they didn't feel like they released until I applied power. They did replace my front pads and that appeared to improve the problem, but not a total fix.
I've not driven in a strong rain recently (summer here) so can't tell if it's still an issue. Time will tell.
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///M135i
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