I have an '11 Mazda2 Sport that sometimes doesn't make the "tick-tock" noise when I use the turn signal. The green arrow lights and and flashes at the normal speed (and I'm pretty sure the lights outside the car are also flashing as they should), but the audible "tick-tock" sound does not come up. This occurs only about once every 5-10 times I use the turn signal, maybe even less often, but now that I'm aware of it, it bugs me. Anyone else heard of this?