Issue Maintaining Logged in State

We are encountering a strange situation where accessing pages in one specific area of the site causes the user to get logged out. I have reviewed the code for those pages and they do not touch cookies except to check logged in status. That is necessary as logged in users see a different result from others. Clearing the cache in Chrome does not help but I think it ignores the do not cache headers. The following is sent with every page:

"header('Cache-Control: no-cache, no-store, must-revalidate');header('Pragma: no-cache');header('Expires: 0')"

 What is more strange is this only happens with Chrome. It does not occur with Firefox or Edge. 

 If anyone has encountered this did you find a magic meta tag which resolved it?