Hoping for some advice on the i8. Been to dealer twice with strange ticking noise from drivers side rear. Can hear with window open . Not road surfaces, not wear indicators on tyres. Two new rear tyres put on 1 month ago, ticking still there. Dealer doesn’t know what it is. Happens mainly when car is warm or has been running- quite an odd noise but really doesn’t sound right!! Sounds like the noise you get when you have something stuck in the tyre groove- and it hits road sporadically- but it isn’t that!! Any advice welcomed!!