[AC Question]

Hi, last couple of weeks i've been having a problem with the S7 edge while charging , it says it is fast charging but it's actually not, ex. when i plug it in it says fast charging (approximately 1 h 30 min until fully charged) i come back 30 min later and it is 1h 28 min until fully charged.
If you wipe your cache it will start charging normally but you have to do shut your phone down wipe cache every time you want to charge your phone.
I have two different chargers both samsung original and it's the same with both.