I’ve been flying with my APM 2.5 successfully for some months now. Everything worked perfectly. Since yesterday the USB connection does not work anymore. On USB and without other power the LEDs flash and the calibration seems to be working normally. But there’s no connection to the mission planner. The computer does not recognize the USB connection. I tried it on another computer with other cable and compared with other APM 2.5. I updated the software after the problem occured. Did not help. The problem is definitely in my APM. Any ideas please?