Dear Colleagues,
Thank you very much for the tips. I have updated from version 0504 to 0610 (without loss of user waypoints). Hopefully that will be the fix. Have to wait until next flight.
Sorry to hear of negative experience.
Personally very pleased with the unit. I normally use it with EGNOS switched off (accuracy more than sufficent). Input a route prior to take-off, then leave it alone in nav page (rose, bearing and CDI) to auto roll down the waypoints as each is passed. Terrain pop-up surprised me one day - was a mast 300ft below my cloud depressed cruise altitude.
Also a great training aid for the more advanced Garmins.
flyme.