"Jay Honeck" wrote

I've repaired it -- twice. When the temperature gets down to near zero,
it
just cracks again...

You are having a problem with different coefficients of expansion.

I don't know exactly how the face mounts, so this suggestion may not be
exactly right. You need to fix it again, the enlarge the mounting holes and
not tighten them up so tight, so when the metal of the radio vs the plastic
gets cold, the can shrink how much they want to, without putting pressure on
the faceplate.
--
Jim in NC