W7 SP1 with SHA2 support?
Please clarify…you did clean reinstall N360 24.8? and you did review N360 Settings?
as test: try
Preset scans = manual
File Cleanup = off
Optimize Disk = off
Secure VPN = off
Software Updater = Auto-Update off & Ignore any/all
Cloud Backup = off
Norton Community Watch = off
Share app-usage data = off
Norton Security will continue to provide updates for Windows 7 SP1 or later with SHA2 Support
https://community.norton.com/t/norton-security-will-continue-to-provide-updates-for-windows-7-sp1-or-later-with-sha2-support/231790