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I don't know, Android auto on a lot of phones is tetchy, to say the least (and I worked on the project so I can say that :P ). I'll try and find a way to go around it. I suppose you are on the standard equipment in the Corsa?
Cheers, I'll see if I can find something
EDITED : yep, sorry to say, it IS a global issue with the K20/Mi9T, they all seem to have exactly the same issue. Which, in a twisted way, is good, as it means the numbers are there to get the devs to sort it out in an update. Make sure you use the settings-feedback tab to log the problem.