I think I know the answer to this but I'd appreciate a second opinion before stripping down...   Fah Pah ArduCopter kit, ready for first flight, everything working well except occasional 'clicks' from motor(s), can't tie it down to one motor in particular.   I've changed out the bullets on the motor side and are nice and tight now (they were all loose), wiggling wires doesn't seem to have any eff…