I upgraded to a 62 about a year ago...haven't had any problems until this weekend....did a software upgrade from garmin site...then magically my PQs were invisible...when unit attached to computer the PQ was there...but the unit wouldn't display...called Garmin and they totally put the problem off on Geocaching.com....finally he told me how to re-boot and the PQs were now visible...but a new problem developed.....if I go to a cache...then attempt to page on something else screen of GPS goes blank and shuts off.....I have tried re-re-booting, re-loaded upgrade, re-did PQ and still the same problem...any ideas why this is happening????