I bought a Transformers Optimus Prime 09l (genuine), but the sound switch at the bottom is not in good contact and often makes noise in robot mode. A bump in a black circle.

First of all, if you don't play often, I suggest you remove the battery. After all, the acousto-optic mechanism is mainly to adapt to young players, and it is easy to burn without playing with batteries. Secondly, if the trigger button is a little loose, it is suggested to click a little 502 on the protruding small button to make it bigger and easier to get stuck. Pay attention to the size of a drop, but only if it is loose, because I also watch it. . .