Weird Electrics Problems (tailgate and columbus) Help Please

[snikom]

Hi there so I am having some electrical issues which may or may not be related

Car is 2013 Superb Estate 4x4 140bhp.  Totally standard, about 150k miles

The first problem is that the boot latch re-opens itself

This happens every time we have been on the ferry (we travel to Ireland a lot to see aged in-laws)

When we get in the car, the boot will just unlock itself.  You can hear the motor/actuator whirr.  It then takes multiple opening and closing of the boot to make it finally operate.  Sometimes you can be back in and sat in the car and then it will just open again, others it will lock and immediately unlock.  We have tried loads of different combinations, keys in ignition, keys out, lock car with key fob after closing boot, etc etc but cant work out why it eventaully locks properly

On all but one occasion so far we have manged to get it to stay shut before we offload but it is just stressful enough as we have the dogs in the boot.

I have wondered if this is to do with vibration on the ferry or the cancelling of the alarm (which we do when we leave car on ferry as otherwise dogs moving in boot can set it off), or possibly damp.  I was thinking of changing the boot lock and/or actuator but then read here about wiring loom issues in the door and so am wondering about that.

The second issue, which started about the same time but has just got worse and worse is the columbus unit becomes unresponsive and reboots every so often.  This started out as just occasionally on long journeys but has now got to the stage of every ten minutes or so.  I had wondered if it was overheating or similar but am also wondering if the two faults are connected.
I have reset via the buttons and also in menu but it has made no odds.  I was wondering about just replacing with a new chinese unit with android auto built in.

Thank You