two possibilities
One is to turn off the fast charge of the mobile phone, turn on the fast charge, first open our mobile phone, and then find the setting, enter it and find the \"power saving and battery\" again; Then find the \"fast charge acceleration\" function in it and enter its function; Finally, in the interface, open the \"default use fast charge acceleration\" function, you can complete the fast charge Settings.
Then the data line may be broken, change a data line can be.
One possibility is that the temperature of the mobile phone is too high, more than 40 degrees will lead to the mobile phone, it will lose the function of fast charging, there is a case that the charger is faulty, need to replace other chargers to try.