It should be the contact problem between your charger and usb interface. Blackberry can't be charged without what you said. In addition, you should pay attention to the charging symbol. When you turn off the battery, the led light flashes and breathes. When you turn on the battery, it should be a lightning symbol. Pay attention to it yourself, or change the position of the mobile phone. Don't unplug it after plugging it in. Change the position of the mobile phone.