loss of power

Hi guys. I'm new to the multicopter world and I have a problem.... I'm using mission planner and have just started doing short missions. Mission Planner asked if I wanted to update the program and I did. It seems ever since then I cant get enough power to the motors. It hardly takes off and drops down again. I've re calibrated the radio and esc's. I'm running a pixhawk controller with 30amp Aphro Opto simon k esc's. Max throttle is  now at 1000 in mission planner. Please help.

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