A problem that has occurred occasionally over the last few weeks but appears to be getting more frequent. I switch on the ignition, powering up my Garmin Nuvi, the local map appears - but there's nothing much on it. In particular, no roads. I've tried changing various settings, such as level of detail, but nothing works. If I power it off and power it on again, then usually (but not always) the roads appear. My Nuvi is 10 years old - is it time to accept that it has to be retired?