Control unit fuse keeps blowing

[CoolChris2k16]

Hi guys I have an issue with my A3 Sportback on a 2009 plate, sometimes the rear driver's door opens on the central locking sometimes it doesn't, also the control unit fuse keeps popping which then stops the boot from opening on the fob and the button on the boot itself. Not sure what to do and who to go to. Please help

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[Marek196c]

check rear driver door harnesses for any short circuit (often happens) just take out the rubber that driving the loom between the door and chassis. If not investigate future inside door.