Hello d.worthley,   I'm attaching the downgrade considerations from release note 6.2.3x  https://www.cisco.com/c/en/us/td/docs/app_ntwk_services/waas/waas/v623/note/waas623xrn.html#52871 You can look for the release notes of your current version here...

Hello,Check the disks status using show disks detail, if you see one offline or with errors, or if there are disk-related alarms (show alarm detail support) please share.