NinjaTrader does not control your Machine ID directly. Your Machine ID is generated by NinjaTrader based on your PC's fundamental hardware (like RAM, motherboard, etc.) and fundamental software (BIOS/UEFI version, Windows updates, firmware updates, etc.). If any of these items change, your NinjaTrader Machine ID is likely to change as well. One way to help prevent your Machine ID from constantly changing is to turn off your computer's Auto-Updates.