Found this online "First try Safe Mode which disables any downloaded apps and leaves the stock ones working and then see what happens. If it stops then one or more of your apps are causing this. Come out of Safe Mode and start deleting your most recent apps one at a time until it stops.
If the issue does not stop in Safe Mode then..
1. Turn the phone off and then from a set series of button presses go into the phones system files and clear the cache. No info is lost this way.
If no help....
2. Back up and remove any relevant Sd card and factory reset as a last resort.
If no help.....
3. Use a Samsung Experience Store / Samsung Service Centre"
