Try this - 1. Try to charge your device with different samsung charger and cable, your might be damaged. 2. Wipe cache partition. 3. If this is happening after installing any app uninstall it. 4. Factory reset.
Thank you for sharing your concern. We acknowledge your query and apologize for the same. And please follow the easy troubleshooting steps which might help to solve the issue.
1. To increase the charging speed, turn the device or its screen off when you charge the battery. Please check if, Fast charging feature is activated. If the feature is not activated, launch the Settings app, tap Device care → Battery → Charging, and then tap the Fast charging switch to activate it. To use the fast charging feature, use a battery charger that supports Adaptive fast charging.
2. If the device heats up or the ambient air temperature rises, the charging speed may decrease automatically. This is a normal operating condition to prevent damage to the device. You can charge the battery more quickly while the device or its screen is turned off.
3. Check the USB cable is pushed tightly into the charger. It needs to be pushed all the way in. If not so, the fast charging features do not work and a very low capacity for charging will be supplied. Accordingly, the charging speed will decrease and the time to charge the battery fully will also take much longer.
4. If the issue has not been resolved then update the software in the device (if available). Menu>apps>settings>software update>install.
In case the issue still occurs. Please register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error reprot/Ask questions).
