Does the iOS operating system get messed up over time?
I first got an iPhone 4S the day it came out in 2011. Since then, I have never set up any of my iPhones as a new device. I have always faithfully used my laptop or iCloud to backup and restore whenever I had problems. When I got an iPhone 5S in 2013, I used the backup of my iPhone 4S to restore it so I didn't lose anything. So I've been going on 4 years with the same iOS operating system installation instance (iPhone 4S came with iOS 5, and I've updated over the years and am currently on iOS 8.4)
I'm wondering if the iOS operating system files get messed up over time, because I have been experiencing some weird problems on my iPhone 5S.
- I completely deleted my camera roll a few months ago, but the usage statistics in the Settings.app still said there was 450 MB of Photos. I used iFunBox to browse my iPhone, and it turns out there were photos taken years ago on my iPhone 4S that never got completely deleted. So I deleted them in iFunBox and got the usage to show 0 MB.
- Sometimes when I shoot photos in the Camera.app, there is no shutter sound (yes, the ringer switch was set to "on", so it wasn't because of that).
- Sometimes when I'm prompted by Touch ID and provide my finger print, the prompt just sits there, no matter how long I leave my finger on the sensor. Then when I tap "Enter password", it continues like normal as if I had supplied just my finger print.
- I deleted a game that was taking up 169 MB, but it still shows up in the usage statistics, except the name field is blank. No matter how many times I delete it from the usage statistics, it still comes back.
I would love to do a clean install of iOS 8.4 on my iPhone, but there's no way to ensure all my settings and app data isn't lot. It's not like a laptop where you can save your files to a flash drive, wipe the system, perform a clean install, and then copy the files back from the flash drive. Does anyone have some advice for me?
iPhone 5s, iOS 8.4, AT&T