Can anyone advise on my issue with Dab,

Its not worked for 18months so I have Just got around to replacing the module which fixed it kind of,

It will work if you turn ignition on and work when you start motor on Dab setting but once engine is started you have to turn volume left or right once for volume to appear or its muted.

But then if you select another source like radio fm or cd then you can not select dab again until gou turn engine off Or if you start the car not on dab you cant use it, Has anyone had this or can advise what you think might be the issue?