One way to resolve the issue is to try to hard reset your iOS device. But there’s a quick way to free up RAM on your iPhone, iPad or iPod touch to improve performance without needing to force restart your device.
How to instantly free up RAM on your iPhone and iPad
Please note that it is not advisable to purge RAM on iOS frequently as it does a pretty good job of memory management as it can have a detrimental impact on battery life. You should only use this method when you notice that an app or your device has become sluggish.
How do I know it has freed up RAM?
You can check out the screenshot of ActMonitor’s widget below. The side-by-side screenshots show the memory usage before and after following the method explained above. As you can see there has been a big jump in free memory (it jumped from approx. 100 MB to approx. 900 MB) after following the method explained above.
Nothing better than killing to birds with one stone. Also, I doing this method on my iPhone 6s, I did notice that the force closed app does stay in the app switcher. So, whereas the swipe up to close from the app switcher method removes the app completely, this secondary method simply closes the app if you were having issues with it.
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