For several years month after month MOZ crawl reports 5xx errors on many pages. Almost every time all the pages work fine as fa as i could see. Google webmaster tools does not notice any errors.

Could anyone explain how to fix this situation?

Should i get a refund from MOZ?

You wrote "until the subscription comes up for renewal" - Is it charges automatically, or it gives me a chance to decide before hand?

Try this:

http://sourceforge.net/projects/goog-sitemapgen/files/sitemapgen/

When I said " good directories " I meant http://www.seomoz.org/directories/ Do you think these directories will cause Penguin signal to be triggered ? As of my 2nd advice, do it on the right pace. Few factors need to be determine how much to do per x time. Obviously I will agree that directories submission you can find on commercial seo tools will trigger Penguins signals and one should avoid them. Are we good?

Guys, why to be negative? Today is December 25th

Mr. Singh didn't say what "Directory submission" he meant. There are very good directories that we have to use, anybody disagree?

Regards the other part of "day limit" for Directory submission, the pace is all based on two factors:

1. how many links and their quality you have now?
2. can you keep the same pace overtime month in, month out?