
If your iPhone isn’t really giving you the performance you’d expect, there are several things that could be wrong with it, and here are the top four signs you can check and rectify.
Sudden Restarting
If your iPhone simply turns off and restarts on its own, and this issue occurs very often, it means your device is either getting too hot or too cold. While a cold restart isn’t too bad, it should return to normal once the battery warms up. But overheating can seriously damage parts of the iPhone, including the battery.

Source: The Verge (Apple)
Some other reasons for a restart could be internal damage, or possibly some software issue – like a dodgy app. If your iPhone is frequently turning off despite a normal temperature, then you should get it checked out.
A Fast-Draining Battery
Since your iPhone uses a Lithium battery, your battery health deteriorates with each charge. Over two years (or about 500 charging cycles), you’d expect to have about 80% of battery capacity left. That means an iPhone that would’ve lasted for 10 hours of use would now only survive an 8-hour run off-charge. You can check your battery health by going into Settings > Battery and tapping Battery Health.
If your iPhone has very low battery health and it’s dying too quickly, consider upgrading to a newer model. Alternatively, you can get an out-of-warranty battery replacement from Apple for $69. This is a much cheaper option than buying a new iPhone.
No iOS Updates
Apple eventually stops supporting older models with updates, and that might be a sign that your device no longer stands in the current range of Apple’s software perks. Since these updates include vital security updates that patch serious problems with your device, not getting these updates, can put you at risk of being hacked.
Check if you’re still getting the latest updates in Settings > General > Software Update. If you’re not then it’s highly recommended that you upgrade your iPhone to a newer model that still gets security updates.

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