When navigating wp-admin, the site seems intermittently not to process requests. Navigating to a post or page will just keep you on the original page. Updating a post will not take affect. This is happening with various sites on one multisite (using different themes).
Initial step was to disable all plugins and themes to try to pinpoint the issue. But after cloning the entire server to a new test server, we were unable to replicate the issue.
Any assistance in what I should be looking for (problem with server config, theme issues, multisite setup) will be helpful.
Theme: Custom built, Child of 2011
Server: IIS 7.5