Check the Apache processes. I had this same sort of issue a while back and essentially what was happening was that the requests were being made faster than the server could handle it and at that point every slowed to a crawl. This was leaving hundreds of Apache processes running and waiting for the next thing that never came.The server load was up to 15-20 on the CPU. I restarted Apache and the problem was solved… Until it got overloaded again….
I hope that helps somehow. 🙂
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