2017 Mazda3 5 door, 6 speed with 35k miles, purchased private party in May 2018 with 23k. Northeast US. Been a great car, but one very annoying issue I've been having is that the passenger side blind spot monitor stays light up when with no car next to me/behind me in the right lane for minutes. If I signal to move into the right lane, it will beep at me too. Basically how it acts when a vehicle is in your blind spot, but there is no vehicle. It's an intermittent issue. I wash my car every other week and it happens in all weather conditions, even when it's sparkling clean on a sunny day. I'm sure the dealer will just say they couldn't duplicate. It has not been in any accidents. Has anyone else has issues?