It doesn't happen often but this noise has just appeared a week after I had some new tyres fitted. Can't see any visible signs of a problem. And going over speed humps and general driving there is no noise and everything feels ok. I did a search on here and a few people have said steering maybe at fault but I don't its anything that extreme. But weirdly this morning no noise at all!!!! Should I get it checked or just leave it till its next service? Computer says due in 4000k time.