The hamster twitching is a intentional - the steppers are pulsing periodically by the software to ensure the doors are shut - a VAG requirement for stepper motors such as ones from SAIA
sorry, SAIA means SAIA BURGESS - the manfucturer of the Stepper motors (or at least the original manufacturer)
The Stepper motor drives the door and is designed to pulse basically by software. A noisy stepper motor (i.e. loud clicks) is annoying and can be resolved by changing the stepper motor, however this will never be under warranty. Some are loud and some are almost silent.
I've been out of the industry for too long - SAIA were the original manufacturer, however I know BOSCH were developing copies even 3/4 years ago.
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