This problem may be your phone's own power management system failure, may only be an individual phenomenon, may also be related to the charger, if it often appears, may be bought the mobile phone is not the original genuine, by the unscrupulous changed the mobile phone battery, if you rule out this possibility, it should be the charger problem, of course, if your 6p often charge, For example, if you charge one or two times a day, the battery life will be greatly shortened! So it may be that the battery is about to die, you see if the power will not drop quickly when you do not charge, if the block, it is likely to be the battery life