This is on a 2018 Model S 100D, FSD with HW3 and Firmware 2019.40.50.7 Several times over the last 4-5 months, I've received two bells like the sound you get before hooking up your seat belt. At the same time, the dome lights come on and then stay on for 20-30 seconds. There are no warnings or indications on the big screen or instrument cluster. I always hook up the seat belt and everything else seems in good order. Each of the 4-5 times this has occurred has been within 2-3 minutes of starting a drive. A mobile tech was out a couple of weeks ago on an unrelated issue and was stumped by this, saying to note the time, etc., and they may be able to figure something out from info on the server. Does anyone have any insight on this? Also, as a bonus, does anyone know how to disable the obnoxious and unneeded for me anyway, seat belt warning? Thanks.