Problem Repeated notifications J3


Repeated notifications J3
Howdy. My mother has a j3 and I don't know where she says that she walked through it, that she is not very good at it, and now when she receives a notification/message it "beeps" or possibly vibrates (if it is on vibration ofc) every minute until you see the notification or swipe left/right from the notification panel. Android is 5.0 or 5.1. I simply cannot explain what he did.