That is probably the exact reason that most, if not all, the flooring people around here advise not to use hardwood. Instead they recommend laminate with a moisture barrier underneath. Sorry you'r having this problem. The only solution I can think of is removal and replacement. Was the concrete sesled prior to installation?
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Greg
A pessimist is an optimist with experience.
"In my many years I have come to a conclusion that one useless man is a shame, two is a law firm and three or more is a congress." - John Adams
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