Like I said,,the suspect is low voltage and it can be caused after a couple of weeks b/c the voltage regulator is not fully rechanging the battery.. you are fine until the battery starts to get low. So, I would look into the VR..it is cheap and a very common, wear item... and it take 5 min to change.

They checked battery condition, but I bet they didn't check changing system, did they??

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A Dalton