Pixhawk FMU power turns off when armed

Hi,

Does anyone here have any idea why my FMU power light turns off when I arm the Pixhawk?

The FMU power is solid green right up until I arm the Pixhawk and then it shuts off. The mavlink also shuts off with the FMU. I don't know if it makes any difference, but I am running the pixhawk off of a UBEC through the servo rail. Maybe not enough power once servos are running?

Any help would be greatly appreciated.

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