Solutions
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Mariopilot's post in Joystick question was marked as the answerHi!
It seems FS creates entries for every single joystick you connect to the computer. Your new joystick will generatew its own config section, so you may have to re-assign buttons (axes generally work right away) for the new one (Extreme 3D). Your old one should not disconfigure next time you plug it in. Once you configure the new one, it should all be automatic (no more reconfig) provided you plug them in to the same USB port every time...