This is the most common smartphone problem. This problem is most of the time caused by keeping apps running when not in use, installing unnecessary apps that choke your device’s RAM storage and saving numerous files on your device which congest your internal storage.
•Solution: Close apps that are not in use, uninstall and disable unnecessary apps, free up your device’s storage and clear your cached data. If the issue still isn’t resolved you can download diagnostic apps like Phone Doctor Plus and Test to help pinpoint the problem. You can also perform a factory data reset to wipe your device clean, leaving the software of your phone the way it was when it was first turned on.