I have a 2018 Model 3. Bluetooth has been mostly fine until recently. Perhaps it was latest firmware update? My issue is that the bluetooth connection to my phone (or any phone) disconnects every 18.5 seconds, then reconnects. Unable to have a phone conversation when it drops out, nor can I stream music from phone. I have tried all suggested solutions to reset bluetooth, including restarting phones, rebooting Telsa screen, removing and re-adding phones to bluetooth. Sometimes after several attempts, usually rebooting Tesla screen, the problem may go away for a day or so, but then comes back. Customer support so far has not been able to track down the issue.