@marciastr32 , Marcia, You may want to perform a Hard/factory reset, firmware,app,update could be causing issue. You will loose all data,info, settings,apps, performing hard reset.
Turn the tablet off.
Press and hold Volume up and Power buttons until the Samsung logo appears on the screen.
Scroll to wipe data/factory reset by pressing the Volume down button.
Press the Power button.
Scroll to Yes delete all user data by pressing the Volume down button.
Press the power button, it will now wipe contents.
Press the power button, Tablet will reboot to setup screen.
1st link below may be a little more detail on how to reset and the other is troubleshooting wiki from ifixit. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
Samsung Galaxy Note 8.0 Troubleshooting