Well the Hitec 7985 certainly exhibits that characteristic. It just seems to go to sleep while still holding the throttle arm in position against the spring. I did notice it sort of wake up from time to time though as you could hear it and see some current on the meter .... then it would go back to just the idle current again. I watched that cycle repeat itself several times during the test. I wonder if this is what causes the "kick" some people complain of on the 79xx series servos on some control surfaces? I thought it interesting and certainly not something I had ever noticed before with any digital servo.