1. 2013 T5 - weird noise - any suggestions?

    Hey Guys,
    I hear this noise from the rear cabin and it sounds like a high speed drill running for about a second at the most.
    Has anyone got a suggestion as to what it might be? I only hear it on occasion, maybe once every 25km and it seems to be random but I also think it happens after going over a bump.
    I've got to get the van serviced soon but I want to now what this is and should I be worried about it.
    Thanks in advance,
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