During the upgrade of Endpoint Protection client there are Event ID 15 errors in the Windows Event Log for RegFilter referencing that the RAM disk is full and that the Registry Filter failed to save changed registry data. Subsequent reboots after the installation process result with PTP errors related to a failure with Sonar definitions.
Event ID 15, RegFilter
The Registry Filter failed to save changed registry data because the RAM Disk if full. Some keys might not be persisted correctly.
The default size of the Windows Embedded 7 RAM disk needed to be increased to support the changes during the migration/upgrade of the Endpoint Protection client. A clean install was not affected as it is able to stay under the default threshold of the RAM disk.
The size of the default RAM disk was increased to 3 MB which created a RAM disk of sufficient size to support the changes to the system and Endpoint Protection client during the upgrade.