A few people have posted issues about a knocking noise in the dash upon startup. Has anyone tried fixing this? I'm technically still under warranty, but I'm very protective over my FiST and don't want to take it to the dealer here in Phoenix. My guess is that it is the blend motor making the knocking noise, but I could be wrong. It stops about 8 seconds after start-up. The noise seems to be located in the dash near the ignition button/air vent.