I have a log of about 3M that contains the entire ping history from about 3PM yesterday until about 10AM this morning.
I'd be happy to advise you further, but I don't think that there's much more I can do over the forums. The problem seems likely to be complex enough that it would require more detailed analysis than I could really do here. I do offer professional consulting services through my employer, Connect802. You are welcome to contact me at firstname.lastname@example.org if you would like to arrange for further analysis of this issue.
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