I've been using a Garmin 390 for a couple of years now and, generally speaking, it's been really great and very reliable. However, just recently its started to lose power intermittently. A quick press or re-seating of the unit in the cradle usually fixes it, but only for a while. This leads me to think that the cradle contacts are not connecting reliably with the contacts on the back of the Zumo unit. As any 390/590 owners will know the cradle and unit contacts are not exactly large or substantial which is probably not helping. I've tried re-seating the unit, cleaning the contacts with switch cleaner and re-positioning the contact power lead in the cradle, all to no avail. Has anyone else experienced this issue and have you managed to fix it?