Reasons for downswings?

[johnzzz]

I've just read a long sequence of posts on a downswing in the Party beginner's tables in the micro-limits forum. It got me wondering how to tell what is the cause of a downswing.

Of course I know there is no such thing as a downswing - every hand that is dealt is RANDOM and INDEPENDENT. Therefore downswings just exist in player's imaginations. But what causes them?

Some possible reasons:
1. Hero's poor cards.
2. Villains' good cards.
3. Flops, turn and river cards.
4. Hero's bad play.
5. Villains' good play.
6. Other reasons.

Ok, these are some possible causes but if I've had a 100bb downswing how can I tell which one is the main cause?

There is so much knowledge about other aspects of the game surely there must be a way of analysing the hands to discover the reason for the downswing.

We've all had sessions where we just fold, fold, fold... That's the fault of the hands we have been dealt.

How about six or seven top pairs loosing at the showdown, every pocket-pair misses the flop, and every flush-draw fails? Again this is just chance.

Is there is a systematic way of finding out? Can PT be used? What about the online stats?