Phones eating data updating.
We have four people on our plan. Two of the phones are Iphone 4s, one 5 and one 6. The two 4s never go over data (okay they are us old folks) and the two newer phones (ie the kids) usually are higher in usage but not over. But about twice a year the 5 and 6 phone go crazy updating every three hours and use up all the data while the kids are sleeping in our house with ATT wifi. We have racked up 2 overuse additions in a week with the kids doing nothing new to their phones. I am so tired of calling and having to deal with this. Is it because the wifi in our house (ATT) is terrible or is it the phones? Every time I call it is the same nonsense....change the wifi setting on the phone for each app etc. But because I lose my mind when the phones use too much data, the kids already have their settings in a way that 90% of the time it works without a hitch, and then it doesn't and we make donations to the ATT fund. Help!!!