I experienced something new to me last night when replacing the glitchy 3.7g rudder servo in my yet to be maidend Mini Mustang with a 9g tower pro knockoff. I used my radio to center the new servo and all was well but after install I turned my radio off and the servo began to spin continuously (shoving itself loose from its newly glued position). It wouldn't stop spinning until I connected the radio again. Repeated the same procedure with an identical servo and get the same results. Repeated again with a different brand (3.7g) and get no movement as usual. Used the same RX channel for each servo, what am I missing here? For now I'm just being extra mindful to keep the TX on at all times (I know that's what I should be doing anyway) but it is a little unnerving to know if I forget or perhaps it drops signal mid flight it will lose rudder.