Entertainment system turns on when parked

[LondonAlphardEnthusiast]

Hi all,

On our first camping trip in the Alphard (2006 hybrid), and something very weird is going on. The entertainment system is intermittently turning itself on and off while parked. It’ll turn on, go to the Toyota boot screen then to the last page we were on (radio or hybrid state etc). This, of course, runs the battery down, especially when parked for an extended period, as we are when camping. 

Anyone experienced this or other similar issues? It’s driven us mad to the point that I have taken to unplugging the battery til we need to start the van. Infuriating. 

Thanks!