Is this normal? WMT crawl stats seem erratic

[Karma]

Since the Panda update, I have seen my crawl stats acting rather strangely, almost erratic.

screenshot [i.imgur.com]

Is this normal? Anyone seeing similar things?

[goodroi]

Crawl stats can be impacted by the changes you make to your pages and/or changes to your links and/or changes to social signals (not to mention WMT has a reputation for inaccurate data).

Are your rankings ok?

[Karma]

Not since Panda, no. I have made many changes since though, so I'll put it down to that for now.

Thanks