Has anyone had a problem with a Pioneer AVIC-EVO1 sat nav coming up with check antenna message?

[chris1949]

Has anyone had a problem with a Pioneer AVIC-EVO1 satnav unit coming up with "check antenna" message when on DAB radio? When this happens I can't alter the volume or anything without switching the unit off and re-boot. Problem happens again a few miles down the road. Frustrating!! Thanks, Chris