Hi TerryB, welcome to the community!
Boot the phone in safe mode like @Uliwooly suggested. If the problem doesn't persist in Safe Mode then power the phone off and on normally > go into Settings > Apps > Downloaded > Clear data for apps you have downloaded > delete any apps youd don't use/need any longer.
If the problem does persist in Safe Mode I would advise running a software repair on your device using PC Companion:
Note: This process will delete all user data, to do a backup:
1. Open PC Companion on a Windows computer.
2. When installed, start PC Companion on the computer.
3. Connect your phone to the computer using a USB cable.
4. Click Start under Backup & Restore.
5. Follow the on-screen instructions.
(Exactly what contents will be backed up may differ depending on phone model.
You can view detailed information about this as you follow the steps in the Backup & Restore wizard).
Running the software repair on PC Companion:
1. Install and open PC Companion then select Support Zone.
2. Phone Software Update.
3. Start.
4. Repair Phone
5. Continue
6. Accept data removal
7. Next
8. Wait for prepare
9. Select Phone
10. Follow the connection steps
