I was going crazy too because I started to have this crazy notification teasing me very often, so I found a good tip on you tube... Go to accessibility and disable notification reminder.. This should be sufficient to bring you some peace
My camera in Huawei mate 9 has never been working for more than a week since I bought the device 5 month Ago... It is very frustrating how there is no response from the manufacturer or update to resolve this bog issue.. Not a good attitude of newly establishing name.. I have no more trust in Huawei