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Here's a post with the common reasons why you get that error. https://seomoz.zendesk.com/entries/409821-why-isn-t-my-site-being-crawled-you-re-not-crawling-all-my-pages If that doesn't solve the problem, contact the help team at help@seomoz.org.

If you take a look at what changed first, there may be clues as to whether or not you changed something that should not have been.  With any change we make in sites, we are very clear there will be fluctuations in the rankings for up to a couple of months. Now, typically, you will begin to see movement after a few weeks but it is not guaranteed. I would wait a couple of more weeks and see if you are moving back up.  If we had a few more details we could likely help a bit more. Note, you do have a few on page issues you might wish to address. (title tag length, keyword cannibalization, etc ) Best

Thanks MJ, I already bagged this one...

no its not personal results in my case, as I have it turned off, and seoMoz staff see the same results when they check manualy. i have alerted them to my resulsts and they are at a loss to see why. They also are concerned and they also want things right, but are at a losss to explain it. It would not hurt to give feedback, just to let them know, there is a feedback tab on the left as you can see, it may be better to use the feebackk tab on actual page as that may give them theat info.