RE:

[Jim Naylor <jnaylor@avnet.co.uk>]

>It sure sounds to me from the symptoms that the radio is overheating.  If I
>were you Jim, I would but a fresh air tube blowing cool air behind the
>panel directly on the radio at all times if possible.  A little heat does
>funny stuff to some of those silicon circuits.

Thought of that one, but it shows the fault from cold as well sometimes.
Also the operating temperature range is quite wide, well within the
temperatures behind the panel I would of thought.
 Thanks for the input though.