1) Clean the appliance according to the instructions in the user manual.
2) Check if the outlet for the small plug is soiled (e.g. clogged with shower gel or dirt), as this may reduce the charging capacity.
3) Especially when you use the appliance on wet skin with foam or gel, it is important to clean the appliance after each use under a running faucet and let it dry.

If the appliance still does not work, please contact your nearest Philips Service Center.