Using Sitecore 8.2 Update 4, Sitecore Experience Profile is not loading (the spinner keeps on spinning) on our Staging server. This was working ok last week - it appears to be an intermittent issue.

I've checked the Log and Crawling log - no entries

Memory useage - 73%

CPU useage - increases to ~50% and holds steady

SQL Profile isn't showing a massive load: Mainly calls to the EventQueue table

Any suggestions on how to diagnose this appreciated. Please let me know if you require any more info