Hi folks.

Yes another access denied issue, none of the existing threads have helped, and I need help.

I'm getting  on random CA pages

Sorry, this site hasn't been shared with you.

The account is the setup account, local admin, SQL SA, SharePoint Farm Admin, sometimes if I restart the browser (clear cache) I can get access to the page.

I've tried with another account, and again random pages access denied.
I've tried with another browser, and again random pages access denied.

In most cases it's to a service app page; eg Configure User Profile Synchronization Connections, but I have access to Manage Profile Service, but may be not to "My sites settings" if I leave it a little while or close the browser I get access.

I've checked the Service App permission and manager, my account(s) are there.
I've checked IIS directory perms.
I've launched the browser as "Administrator".
This only affects CA, all my other web apps work fine.

I've tried from the local server, and from remote PC.

If I keep trying the link I eventually get access... 3-15 tries.

Any help appreciated.

Authentication is using NTLM.

Win 2012
SP 2013