On every power-up, the routine that reads the machine's model and options from its hardware bit code was erasing more of the model record than it rebuilt — including the model-name text. That made the primary copy of the machine settings look corrupted on each boot, so the controller quietly fell back to its backup copy every time. Survivable alone, but it meant the machine was always running on a single good copy; if power dropped at the wrong instant while the backup was being refreshed, both copies could be lost at once and the controller would report "Configuration Changed" and clear its memory. The fix limits that startup routine to clearing only the fields it actually re-reads, so the primary copy stays valid and the machine always keeps two good copies.