You would think that if it was a mechanical issue, it would do it even when letting the byke DS. Since it is not doing it I am thinking it is a software issue. I know that some Chrysler cage transmissions will gradually increase pump pressure to compensate for clutch wear. When replacing the transmission, you must use a scanner and reset the pressures or it will very quickly wear out the new clutch. Hoping it is something like that for you instead of another teardown. May just need a BUDS reflash.