2017 S 75D. Had the FSD upgrade without the MCU upgrade. MCU had been replaced about a year ago and was working fine. After the upgrade, the MCU crashes about every 2-3 hours on long drives. It will freeze, or the navigation will freeze, or it will go blank then reboot. Rebooting (manually or when the MCU reboots itself) now takes about 5 minutes for all but navigation and 15 minutes for the navigation to start and route to the destination it was going to before the crash. Now need to use my phone to navigate when the MCU freezes or crashes because it takes so long to fully boot up. Anyone else having MCU issues after 2.0 to 3.0 upgrade?