The point is that we are getting multiple notifications in a row. I got a 10% notification two minutes ago, and then 30 seconds later, I got another low battery notification. If I hadn't been able to get it to a charger right away, I would have received yet another notification approx. 30 seconds later (as happened last week when I was out of the house and without charging means). Since we have only ever historically received one warning at 20% and one at 10%, it's very weird to suddenly be getting multiple warnings, and we are wondering if this is an iOS bug or an indicator of something infecting the phones? Or just an indicator that our phones are on their last legs? (Mine's an 8, so an upgrade is definitely in my near future--but if there's something infecting my current phone, I need to know before I migrate everything over to a new one.)