Just got a pt2.4 that was 2nd hand but absolutly brand new, and I'm having dropout problems. Changed batteries and took all computers and magnets off bike. Dropped out maybe 10 times an hour for first ride, (changed batteries) did a ride, about the same, did a ride one day later, and it dropped out 2X per minute for a while and got better for a while. I live in a pretty rural area and it seemed to do the same in town as out. I don't know what to expect for dropouts, but this is terrible. Any way to tell if it's one of the older bad ones.