Try plugging in the 2 servos and measure the voltage of another output port, turn on the axon and see if there is a drop in voltage. If not Try it with a different battery pack and see if it still happens. You could even use a cheap $2 4 AA holder battery pack and try that. I know that 4 AA batteries definitely has enough amperage so try that and report the results. If that doesn't work, try writing a program to control three servos and read one adc port and print out the data, plug in your two servos and make a jumper wire from the signal wire of the other servo port to the input wire of the adc port and analyze the signal with the SOR Scope.