I had that happen to one of mine. Did you install, Instagram or snapchat? I contacted Samsung and they had me doo all kinds of things the Las they had me doo was preform a hard key reset which is didn't then a factory reset, so they say, they say it errors everything like brand new no trace of anything, here are steps if you want to try them, it didn't work for me,I am going retrain device fir a new one, but might work for you.
Here are the steps on how to perform Hard Key Reset on your device. 1. Power the device off (remove and re-insert the battery). 2. Press and hold the Volume Up key and the Home key, then press and hold the Power key. 3. When the device vibrates; release only the Power key. 4. When the Android system recovery menu displays; release the Volume Up and the Home key. 5. Navigate with the Volume keys to the wipe data/factory reset option and press the Power key to select. 6. Navigate with the Volume keys to Yes-delete all user data option and press the Power key to select. 7. After user data deletes, press the Power key to reboot system now.
Samsung S5 ROOTED, thank you @geohot.
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