Disabling internal motion sensor (alarm)

Interesting minor issue has popped up with my 2015 GTI

Occasionally I need to leave my dog in the car while I pop into shops for a few minutes and whereas in the past pressing lock twice on the remote fob would disable the internal motion sensor the last week or so I've occasionally had the alarm go off when the dog moves [emoji2]

I know pressing the little button down low on the drivers side pillar disables the motion sensor but the double lock on the remote fob was a handy shortcut.

Has anybody experienced this one?