My main site went up yesterday and then came back down today. The Google rollercoaster is a real PITA.
My website that I have less than a year are going up and down as well. The ones that are up for more then a year are more stable. I think age is a factor as well.
All my SERP movement on the main keyword was basically from the "bottom of the 1st page/top of 2nd page" to "#1/#2 positions". i.e. Sept 17th #11,Sept 18th #2, then back to #11,#10 (yesterday) and #13 (today).
It may not be Panda-related, but something has changed...
Here's a timeline more or less.
Sept 17th #11
Sept 18th #2
Sept 21st #10
Sept 22 #11
Sept 22nd #10
Sept 27th #13
Sept 28 #53
I have No idea what is going on I just know that a few days ago for one day my site spiked huge and the next day almost zero traffic something is in the works again.