Good Evening.
More than likely, this unit, Like Mine has been used with Nickel Metal Hydride Batteries all it’s Life. The AA Ones, as well as the AAA ones, are just a touch longer than the alkaline ones. This will cause the Battery contacts +, and – to be spread out a little more than usual, and when you use Alkalines, they will make connection, but the connection will break if the unit is moved around too much, causing the power to go off.
This can be remedied short term, by pulling the batt contacts towards the center of the unit to allow it to seat better, but this is only temporary, as the metal straps will have a “Memory” and will collapse again.
Permanent way to fix it, is to cut four small pieces of Rubber, and put betweent the contact and the plastic body to spread the contacts, and keep them spread.
Or you can send it to Garmin, and for a fee they will repair it.
I have repaired mine, when it started happening, and have not had a problem since.
Justin
