Audi A4 allroad Questions

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I have 3 Audis and have only owned Audis for over 20 years. The dealership service department told me the crush washer must be replaced at every oil change, this was never mentioned or done ever before. Can anyone tell me if this is correct?
My subjected car recently had a problem when in the morning i start and drive for 1 or two hours automatically turns off and when i keep off for half or 1 hour again starts and i can drive for 1 hour again the same problem.

could you please be so kind to advise what is the problem and how to fix.
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