Sony A65 EVF Problem

I've got A65 from B&H. Surprisingly, when looking through EVF in badly lit room I see a coarse grain with color blotches in the EVF. Of course in normal enviroment and outside I obtain a clear view.

I've had previously GH2 and never saw such a color coarse grain even in night situation.
Could be a faulty EVF ?

Thanks,

Adam
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http://www.pbase.com/adam3544