Try this:
Switch off the receiver, let the servo cool down.
turn it on, DO NOT steer or do any thing, see if
1. it get hot. If it gets hot, that may mean there is a short circuit in the servo motor circuitory. Notice any straight noise.
or 2. it is cool, then
3. "係咁轉一兩個字" see if it get hot. (this is your case ) The gear system or servo motor may be jammed. also notice any straight noise. If this this the case, return it for service, or if you are confident enough, open the servo case, see if there is dislocation of gears or any jamming happens
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