Update: doesn't seem to be an Apache problem, so don't start debugging like I described below.

I've never heard of such a strange behaviour before.

There are two things you can do to find out:

1) Turn on debug level logging for apache. Apache is great in that its logging facilities can be configured in many ways. Try to get as much information as possible. Perhaps it helps.

2) It sounds like Apache is reacting to some kind of HTTP header. Use a network sniffer like wireshark to record the headers of a request that leads to "not ok" behaviour, and then test them to see which one (or which combination) is the offending.

Both approaches can be much work, but it's also a great exercise in environment+config debugging ;-)

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