HI  i have learned to secure the servo connection from my battery pack to my rx to something stationary in the fuse of the airframe -so as to prevent vibration from gigling the connection and causing it to become intermitent-  i heat shrink over the connection or use a wire tie and then use silicone (only -GE silicone two ) it to foam or balsa in the fuse-i lost two planes prior to doing this-no battery connection -no controlsand have not had that problem for 20 years since   i will also use silicone after wrapping my  RX and batteries in foam-  to hold them down inside the plane- it handles vibration very well and pulls  right off when you need to remove those parts  works well to hold down foam covered glo fuel tanks  also  ( i wrap my tanks in duck tap-to prevent tank  expansion-  so the pressure can do its intended job ) do use ONLY GE silicone two- as when it cures it gives off a base -unlike othe silicone that cure giving off an acid that could be harmful to radio equipment    hope these tips will keep your planes flying longer and in better control while there (flying on rails ) -many more tips to come- REGARDS TONY