The cruise control cuts out after driving for 25+ minutes. The rpm’s rev up to 4000 and the speedometer goes wild just before cutting off. It can be reset but does not hold for long. Short trips and a cooling-off period for the engine seem to help. The dealer could not replicate the condition. Help!
Did the dealer check for any codes that may have been thrown?
Having them try and replicate a fault that takes a minimum of a half hour will be an expensive proposition for you (time is expensive), and they don’t want to leave the workshop if they can help it. A independent mechanic will be more willing to look into it, but to duplicate it will not be a cheap option. There should be things he can test without hitting the road, though.