First, Let’s define “overheating”, which is always a hardware problem. If a device overheats it shuts down so it can’t be used, and displays a message saying it must cool down before it can be turned on, and it will probably be unusable for an hour or so. If you are seeing this it is a hardware problem and you should contact Apple support:
Note that both of the above have options to receive a callback or chat
If you are not seeing this your iPhone or iPad has not overheated. However, if you fast charge your device it may get very warm, and may pause charging at 80% and display a message saying that charging has paused, and will resume when the phone cools down. This is NOT overheating, and is normal when fast charging. It also won’t prevent you from using any app you have on your phone.
Going beyond that, what you are observing is not normal, but from the symptoms along it is impossible to diagnose without more troubleshooting. One option is to contact Apple support and let a tech run some diagnostics.
But there are a couple of things to check yourself:
- How strong is your cellular signal? If it is very weak (1 bar), or goes in and out that can use a lot of energy, even when you are not using the iPhone because it stays in communication with the network (so the network can find you when a call comes in). As a test for this put the iPhone in Airplane Mode for a little while and turn on Wi-Fi if it switches off. If this resolves the problems then signal strength can be the cause.
- The storage will vary as you use the phone, as it will dynamically allocate storage as needed, then clean it up when it is no longer in use.
- How do you close apps? If you do it by going to the App Switcher and then swiping up on an app to kill it that will generate a SIGABRT (Unix Signal 6) telling the app to stop immediately each time you do it.
- Do you have a 3rd party VPN installed, even if you are not using it? If so, delete the VPN profile in Settings/General/VPN & Device Management/VPN, then restart your device. Don't just turn it off; delete the profile. If that fixes it, you can try reinstalling VPN, but probably shouldn't.
There is no point in looking through analytics; there is nothing you can learn from them without an iOS data dictionary, and that is only available to Apple employees working in development areas. And even they don’t actually look at logs; they process them with an app that generates a human readable report, because they don’t want to slog through thousands of lines of gibberish either.
