Cage/Holder FM & DAB reception issues

[bbjoylove]

I know this must be a simple fix! But can't work it out!
When the head unit is out of the cage/holder the radio and DAB reception is perfect.
As soon as the head unit touches the cage/holder I lose reception!
This has only just started to happen.
Don't understand as the cage/holder is mounted on a plastic facia!
Any help would be much appreciated. Is it a ground issue?
Thank you

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