m31 charging is slow 30 minutes of charging gives you about 21%. After an hour about 40% charge And full charge takes two and a half hours.
Dear Samsung Member,
Greetings from Samsung Customer Support!
Please perform the below mentioned steps to resolve the issue:
* Charge the device
Kindly follow the standard charging procedure. i.e; please charge the device in switch off condition for a minimum of 10 minutes.
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Thank you for writing to Samsung.
Samsung Customer Support