@theweeman: If you're concerned then please try heading to Settings > Battery and Device Care > Device Protection > Scan Now, and this will search for malware and suspicious activity. You can also try restarting the phone in Safe Mode to disable all third party apps, as this will help to determine if the issue is stemming from an external source. To enable Safe Mode, press and hold the Power button until the 'Power off' prompt appears on the screen then release > Touch and hold Power off until the 'Safe mode' prompt appears then release > To confirm, tap Safe mode.
Monitor the performance for a few hours, depending on the frequency of the issue, and if you don't encounter the same problem then restart the phone as you would normally and delete any recently installed, third party apps.
