The product or one of its features (sound/light/movement) only works sometimes. It looks like the product is affected in some way.
In the ON/NORMAL position of the switch or selector mode, check the check the condition of the batteries if they have not been previously replaced.
The original batteries may be exhausted for the try-me function use or normal use until the moment. Replace them by new ones with the features indicated in the instruction manual included in the product.
Maybe the product is blocked and must be reset. Follow the instructions about the "RESET" function which are indicated in the istructions manual or simply take off the batteries and place them again.
If you have already replaced the batteries but you are using white-label batteries and of low cost, could be that the capacity of them is not enough for the product and/or its play time duration can be severely affected.
Use only batteries in accordance with market standards, recognized brands, and recommended by the manufacturer.