Then there is a mild sign of clutch wearing out too early. Whats the mileage of car, does any one else drive other than you?
Its a 3 year warranty car, dont let the dealership guys test it on their own. Rather call honda factory and ask them to pass you on to field engineers section. One will surely respond. State your problem and ask when will the engineer be there (honda fort, city sales or any other). Its only the field engineer who can classify a problem as warranty case. And marks the dealership guys to fix that out including new parts instalment.
But please, do figure out when the car behaves odd so that you can strongly present your case.