What is wrong with the bodgyro, why is it all buggy?

The bodygyro is following the Ai when the player is shooting. However, it gets buggy when the Ai is ontop of a building and the player is on the ground and very close by the Ai. When the player shoot the gyro goes all crazy. I don't why this is happening. I Just want the bodygyro to follow the player side by side and up and down. I don't want it to be all buggy. How do I fix this bug?

--[[Body Gyro Properties: D = 15 
MaxTorque:100000000, 100000000, 0 
P = 50000]]

local rotate = char.HumanoidRootPart:findFirstChild("BodyGyro")
rotate.CFrame = CFrame.new(char.UpperTorso.Position, (script.targeting.Value).UpperTorso.Position)