We suspect we are under filter/penalty but we don?t understand what the reason is and how to solve it. ****INTRO We are B2B internet marketplace for sale of commercial vehicles from Europe. We are in business since 2003. We are multilingual, 18 language versions, separate domain for each language. Main language versions (domains): Truck1.eu ? English, main domain (works many years) Alle-lkw.de ? German (works many years) Truck1.es ? Spanish (works many years) Truck1.fr ? French (works many years) Gruzovik.com ? Russian (works many years) Truck1.net ? Arabic (works several years) Truck1.pl ? Polish (works several years, first it was truck1-pl.com, then in February 2012 we bought Truck1.pl and migrated) Recently established domains (October 2011): Truck1.it (Italian), Truck1.nl (Dutch), Truck1-lt.com (Lithuanian), Truck1.com.ua (Ukrainian) Newly established domains (April 2012): Truck1-cz.com (Czech), truck1-bg.com (Bulgarian), truck1-dk.com (Danish), truck1-no.com (Norwegian), truck1-se.com (Swedish), truck1-fi.com (Finnish), truck1-tr.com (Turkish) PROBLEM DESCRIPTION New language versions: Almost all pages of these domains have disappeared from SERP. Traffic fell from 100-300 uniques daily to 0-20. Judging by Analytics this fall took place for new domains on May 7th-9th, for recent domains on May 16th-19th. Truck1.pl: Seems that all pages became out of SERP. Traffic cut from 400-600 to 30-60 daily visitors. It happened on May 16[SUP]th[/SUP]-17[SUP]th[/SUP]. Older versions (.de, .fr, etc.): Smooth traffic fall in the last month. All keyword positions decrease. We suspect that our server?s database failure (which occurred on May 16th-17th judging by number of 404 errors) could be the possible cause. But this failure was fixed on May 18th and it does not explain severe traffic fall on May 7th-9th on the new versions. Please advise how do we solve this problem or at least help to find the reason of this situation.