My p3s took a very slight tumble Today, a fall of about 6 inches off my case, flat on it's back.(upside down) I gave up any attempt at flying and went home for a thorough check. Changed the props and calibrated it up the ying yang and took it out for a flight check. Everything works fine accept the gimbal gets stuck in the up/down mode. Moving the gimbal up and down by hand goes fine for a while and then there is slight resistance then fine and so on. I can't see anything impairing the movement. Rather perplexed. I am 100% sure that no part of the gimbal/camera hit the ground and the landing was on sand with a fairly low impact. I know gimbal threads aren't well subscribed, I have done the searches and lets face it, the buggers are a bit complicated and delicate but any help would be very much appreciated.