06 case 440 skid steer with cat hydraulic joystick controls. For awhile joystick would stick when pressed fully forward and I would gently pull fingers back to get it to release back to neutral position. Recently maxed out lift capacity getting SUV out of ditch, now the arms do not raise and lower without ALSO curling the bucket. In other words, straight forward and back on joystick to move arms does not work with any weight in bucket, but if I angle at 45 degrees and also curl the bucket then arms work. If arms are up AND I hold in ride control/self balance feature with index finger, then it will lower without having to curl bucket. Thoughts?