Letting the heat run for a while, then turning off the car and restarting it worked for me. The problem seemed to only occur on very cold mornings. Seems silly, but try it.

Hi check your navigation disc for dust, dirt, damage.
if disc is good, you might like to try running a dvd cleaner in the unit, the avic has a fan that sucks in dust from the car, and this coates the cd lens.

we can service the unit for £45.00 plus return postage @ £10.00 (uk mainland)
www.blueice-electronics.co.uk

Regards

Mark