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First, most important step will be to have a shop check transmission fluid level. Could simply be a case of low fluid. Unfortuantely, this is not an easy job for the home DIYer, since it requires the car to be raised, fluid temperature to be under 30c, and then a scan tool is required to monitor fluid temp, as the car is being run on a lift.
Second step also requires a VW-specific scan tool to check for fault codes, if any, that are stored in the transmission control module.
Any competent European-specific repair shop will be able to do both of these items for you. Expect about a 1.5 hour labor charge.