Made it to a freshwater beach this weekend with my new GT. When I got there I turned the volume switch on and the machine wouldn't power on. I thought great, I left the volume switch on and the battery is dead. I switched out the battery pack with the alkaline pack and same problem, the machine wouldn't turn on. I took the battery pack out a couple times and put it back in because I couldn't believe that both batteries were dead. Eventually after snapping the alkaline pack in the machine turned on so I started hunting. While hunting I found that any pressure on the battery pack, such as kneeling down and setting the machine on my leg or the ground would cause the machine to power off and I'd have to jiggle the control housing to get it back on. Ant ideas what is causing this intermittent power problem?