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July 13, 2017 at 4:12 pm #146780
Je suis desolé, but it sounds as if you have a ground loop in your connections – this is beyond our ability to diagnose.
Try using different cables, and re-arrange the wiring. Make sure things are only grounded at one place (no more, no less).
If you cannot fix it, you will probably need to get a local technician to have a look.