after finding the BB gun yesterday I decided to go back out this morning. Put in a fresh set of batteries and got nothing. Testing the voltage coming out of the battery holder, 18 plus volts. Check voltage at the posts going into the machine, also 18-plus volts. my detector is on an Anderson shaft so it's it's upside down under the arm cuff. if I roll the machine into its upright position it works, as soon as I roll it back upside down it quits working. There are no loose connections in the battery compartment and the voltage stays the same whether it's upside-down or right-side up. I'm not sure what's going on as I have not dropped or even bumped the detector hard enough to loosen anything inside the case. It just refuses to work upside down anymore. Anyone have any ideas? it's just a bummer that I have to send off my machine for repair after only having it a couple months.