Can anyone help please ?

I fitted a new battery to my L322 because it was flattening my old battery.( Which I don't think is old at all ) Now it is happening again.
After motoring for some miles I shut down and withdraw the key set the alarm and off we go.

Hold on I 've forgotten my cap. so I press alarm again to gain entry, get my cap then set the alarm once more, NO the alarm sets, but the Landrover logo stays on the screen and the radio ON/OFF button keeps flashing.Ad infinitum.

To remove the logo and flashing light I have to start the engine again then shut down again and remove key close door and set alarm and all is well again. What is wrong Can anyone help me

Check for damp & corroded connectors in the nearside rear quarter.

Happens to mine on the odd occasion....

I am having diagnostic issues and the rear corner is one place I will be checking later...but this also happened to me before my diagnostic issues...so I am not 100% convinced this hanging screen is moist related...but on an L322 anything could be possible...