Ghost in the machine?

I recently purchased a 2006.5 (did not know they made half years) 350Z roadster touring with 50K and equipped with the Bose 6cd changer. This is a sweet ride however sometimes while listening to my pre-programmed fm channel the station changes without me prompting it to do so. I know the replies to this post will ask if I am brushing the wheel switch but please be assured that I am not touching the steering wheel switch by mistake. Anybody have any ideas on what may cause this?