[Zope-dev] Server seems to stop responding.

OS: Win2K Zope: 2.2.4b1, using ZServer direct Site, large catalog roughly 20,000 items, database size 839 MB. Problem: Zope's running quite happily, and then all of a sudden will stop responding to incoming requests. A restart and its fine. There is no memory leak (memory usage is very low), no other resources consuming space. All log files say nothing. There seems to be no obvious trigger or thing to cause it, only time (or use). Im at wits end to figure out: a) where to start debugging (apart from log files, Control Panel debug etc) and b) solution... Any help will get my undying gratitude... -- Andy McKay.