2009 Pilot EX Front Window Noise?

When travelling on the freeway at say speeds of 60 mph and up, there is a faint, intermittent noise in the front windows that sounds like tiny gravel hitting the glass. It's present on both the driver side and passenger side, though more noticeable on the latter. Has anyone else experienced this?

Thanks.

No; the only thing we've experienced is that the driver's side window always sounds as if it isn't closed properly (wind noise) even though it is. I don't think it is properly sealed somewhere. Sorry.