In addition:
Subscribe to this article:
http://www.symantec.com/docs/TECH248552
It says a hotfix is coming but there is no ETA yet.
Follow this thread as well for all the updates:
https://www.symantec.com/connect/forums/sep-system-tray-icon-warns-multiple-issues-following-installation-january-3rd-2018-windows-se?list_context_id=1403&list_context_type=sc_forum