apm 2.5 ppm/USB wont work HELP

ok so i was testing new video equipment. i had the apm plugged in through usb and power module. next time i tried it usb would not connect. the usb powers on the board and gps but wont be recognized by computer. i checked the other apm board to make

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apm loiter after mavlink lost

So I have been having this problem. I'm sorta new to apm. So what happens is that when I make a flight plan I would go into loiter mode if I lose the connection between apm and the mavlink. Has anybody encountered this ? i have the GSC failsafe off u

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