What is happening?

[Jabe]

It has been drying for allmost two hours, and now when i put it on, same thing occurs... At first time after battery is connected, it armed it self (like it should), after that it keeps armed, switch does nothing else, than makes leds glow and shutdown servo.
And i dont have external bec, i ordered ccbec for my new steering servo.
What is ratings for MMM bec? How much it can handle in amps?