What device and Android version are you using?
This sounds like something you need to log and send to Norton for diagnosis.
Open the 360 app and tap the three bars at the top left. Tap on Settings > General, and scroll down to the Logging section. Turn on Enable Debug Log. Then continue using your device until your issue happens again. After the issue has happened, go back to the Debug Log settings and then tap on Send Error Report with log files. In your submission please include "forum 'your username' " in the Case ID section of the report. Also include a link to this thread. You can turn off logging when you have sent the logs.
If you do send logs, please let me know and I'll notify my contacts to look for them.