After a number of category browses (4 or 5) the category page never loads and the w3wp.exe process is racking up lots of process time and using more and more memory. There is only one user on the system.
We have an a - z menu of categories with sub-categories and then products underneath. It is when we are browsing the sub categories that we get the problem. However if we stop the current page and try one of the previous categories then the page loads without problem.
If we do an admin resetcache then the category browse loads immediately.
Does anyone have any ideas as to what is happening.