I bought my S85 in 2015 Feb and have not replaced the batteries in both my key fobs since then. For the past 2 weeks I have been getting a warning message "Key Battery Needs Replacing" in my main screen and the drivers instrument panel screen. I replaced both the batteries with new Duracell CR2032 batteries, but I still get the warning message on both the screens. I also did reset both the screens and still I get the message. Any idea what would be the reason? I called Tesla service and they asked me to just swing by and they can fix it.