If you don't say what games this happened in, we can't look to see if there might be some other explanation.
Did you write an email to support like I suggested two weeks ago? http://www.chess.com/forum/view/community/about-deducting-ratings
about auto resign
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i m getting auto resign while playing game!! even i didnt cheat anything and manually i didnt resign so this is not to be done!! careless chess.com!