2010 Outlander 2.4 Constant beeping
 

I have electrical gremlins showing up now.
When the car is at standstill, there is a constant "beeeep-beeeep-beeeeep......beeeep-beeeep-beeeeep" coming from the right rear side bumper(?).
The dashboard LCD display shows "LOCK" with an icon of a key lock.
It also does the same beeping and says "Key is still in the car". This is very intermittent.
ALSO.
It Beeps non stop and says "Check doors"
This thing is driving me crazy,
It is spectacularly annoying and very intrusive.
What could this possibly be due to please?
I have attached an image and a short video to show the message and the beeping.

this only happens at standstill, ignition on or off, car running or not. Doors open or not.
Doesn’t happen much when in Drive or moving.
https://cimg0.ibsrv.net/gimg/mitsubi...9d8310735d.jpg

Help, Anyone?
I’m sure this isn’t an isolated occurrence…?