[emerson]

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So the question has often been asked: How big a downswing can a solid, winning player expect to experience playing high stakes LHE? [500BBs? hahahaha]

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You should experience downswings of every size, 500BB, 1000BB, etc. If you have an edge, the bigger they are the less frequently they should occur. You just need to know if this is a once in a lifetime thing, a once in a year thing, once every ten year thing, etc.

If it is online play then the best explanation is that it is probably not bad luck or poor play, but cheating. Too many colluders, not enough fish. Player after player who was a long term winner is suddenly complaining that they don't win any more.