2004 Bentley GT offside rear window

[Valasco1]

Hi all
My rear offside window has just started to go down after I’ve closed the drivers door and locked the car. It stays up when I’m driving .
I have the car on trickle charge when I lock it. Any thoughts please ?
JJ

[Valasco1]

Problem solved

[goddo]

And the answer is.....? Battery or ecu?