How many volts are you running it on, 5 or 12? Maybe the electrical connection isn't great.
Do you have any video from the camera while it's going nutty?
What camera is on the gimbal, is it secure and not moving around?
What kind of flying are you doing when it's having problems? Are you doing loops and rolls?
Running off a standard battery, no obvious loose connection and no stunts, will do it whilst hovering, but I have never seen it doing it whilst still on the table! Oh and it's a gopro hero 3+ that's secured well with a strap! Thanks for youre help
This past week my gimbal started acting up like you said. It is normally very smooth and balanced. I started looking at the wires after noticing a gouge in the support arm. There are a few very small wires that go to the motors . One of them was cut and not making good contact. I spliced the wire and all is well again.
I used a magnifying headset to be able to see .