@ 7000ish hours, machine erased all my work tool settings, and reverted back to OEM programming. Reprogrammed, and 30 hours later, they're gone again. Any ideas? XCK prefix. C6.4 just got new injectors, too. Return rates were through the roof. Hard start when hot.
A year and a half later, and it still hasn't erased the settings. No idea what cleared them the first two times.