My system locked automatically. When I hit a key to bring it out of lock, There was a pop up dialog on password screen that said: The exception unknown software exception (0xe0434352) occurred in the application at point 0x0000000075B19962. The taskbar icon was not visible. Ctrl-Shift-\ woke up 1Password and the taskbar icon reappeared. This has only happened once so far.
After this everything looks normal. This is for your information. I'm not certain if you need me to pursue this further or not.
1Password Version: 7.6.780
Extension Version: 220.127.116.11
OS Version: Win 10 Pro x64
Sync Type: Wifi