[1] - https://docs.microsoft.com/en-us/sysinternals/downloads/sysi...
I blocked windows update with its own firewall. The windows system was not updated for 1+ yrs. 6 month into the "non-update", the windows will randomly freeze for 5 or more seconds. Just rebooting it doesn't help. Eventually I updated it in a weekend and everything works fine from that point on. No freeze events for 2 months now.