• Summary:  Some computers do not install patches at the scheduled time
• Symptoms:  Random re-boot of some computers on the network
• Cause:  Systems were turned off at scheduled patching time and patch setting is set to run "at next connection".

Problem:

You schedule installs of patches at a  specific  time, but some systems are installing and rebooting at later, random times.

Solutions:

Systems were off, and when turned on, they were set to run "at next connection".