On 20/01/2020 12:07, John wrote:
My DAB has been breaking up recently and the radio automatically drops to
FM. This is a bit annoying though die to the slight time difference.

Grubbing about on a Facebook Group someone asked if I had anything plugged
into my Cigar Lighter Socket - I have - a Dashcam. I unplugged it and the
problem went away.

It seems the 12v to 5v ciruit causes interference. I found a couple of
YouTube videos that seem to confirm it.

Now I need a solution!

Replace it with an (inefficient) linear regulator, such as some variant
of a 7805, with a heatsink, instead of the (efficient, but noisy)
switched mode supply that you have?

SteveW