It should be the quality of the wireless charger is not enough to cause, you can check whether the phone is hot and can not be charged, there are a few reasons
1. Wireless charger coil is not up to standard power is not enough
2. Whether the phone has a relatively thick protective shell, resulting in too large a distance between the phone and the charging coil
3. If the USB is connected to the wireless charger from the computer, you can try to connect the adapter directly to the power supply.
Because the voltage of the charging power supply is less than the voltage being charged.
Wireless charging, if side charging, background or running, feel charging is not in place.