You are describing faulty power connection, suggest cleaning the backplate contacts especially if the issue only occurs when attached and powered from GPS mount. Are the GPS mount contacts bent or broken?
Take a photo of the A119S backplate. Did the dashcam get wet or recently disassembled?
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First of all, thank you for your interest. The camera does not turn on with or without a GPS connection. So there's no electricity. It doesn't turn on when I connect the energy directly to the camera. The camera never got wet. I used it very carefully and carefully. But I could only use it for eight months. I'm sorry the camera didn't work.