Yes one of my flap servos sings. It does not buzz. It can't mean anything good. I'm thinking of replacing it.
Also when I unpacked the wings, I found the left aileron was warped up 1/2 inch where it was supposed to align with the left flap. It had been badly packed in the box. I removed the warp with an iron on a low setting.
I haven't flown yet. I'm waiting for the wind to die down. It's 18 knots right now.
I'm using the following set-up.
Placing the Motor Control on the Spoiler Stick when in Launch Mode and Still Using the Spoiler Stick for Landing Flaps in Landing Mode