Hi could some one help issues with radio!

[Andrewf89]

Hi I recently bought a ford transit 05 and the radio needed a code. I got the code and have inserted it all good the radio won't stay on unless a button is pressed !
If no buttons have been pressed it will turn off in seconds ! Any help would be great thanks! I think it's a ford r4000 model and is made in 2010 I think