Android 4.1 is pretty old at this point. Even LG, who is notorious for lagging on updates, is up to Android 4.4.
Sprint has already pushed Android 5.0 on Samsung devices and is getting ready to push Android 5.1.1.
Make certain you have updated the Android operating system on your phone to the latest version supported by your carrier and see if that helps.
You should also make certain, if you have not done so already, that all of your Android APPS are up to date as well.
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