I have just purchased a Picanto, a demo model with only 2500 miles on clock. Thought it was great until I started to get a noise across dash near windscreen, sounds like a trapped bee, normally starts around 60 miles an hour! Seems heat related, when stands in sunetc. Carries on for miles, then if I stop for a while and start off again it sometimes disappears. Is it worth taking back to dealership or will it wear off as things loosen up? Also have a slight noise in drivers door at same speed. Thought it was so quiet until these things started!!!!! So disappointed!