(i) Prob holding a higher gear while the engine warms up; or (ii) I'm not sure if it's got 'fuzzy' logic, in which case it takes time to 'learn' your driving style and will adapt accordingly.
In any case, you may wish to keep it in 'D' for the first 10 miles before shifting to 'S'? 10 miles IS a long time to warm up, unless you get straight on the motorway - in which case, shouldn't you be in 'D' anyway for a smoother and more economical ride?
I'm not ruling out an electronic/ mechanical problem - the above is just my 2 pence worth.
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