The cruise control in my 2008 Ford Focus often disengages when the car is either under load or going up reasonably steep hills. It doesn't appear to change down gears. The dealer has repeatedly made adjustments, but nothing has changed and I can't get it to occur for them, as there are no decent hills near the dealership. Are cruise controls designed to ever drop out under any circumstances, or should the car just keeping changing down gears?
Normally they don't disengage automatically, only when the driver disengages them by switching them off or braking. In other situations where the driver might override the cruise it remains engaged and then resumes where it was set. These things can be hard to diagnose when they can't be demonstrated to the mechanic, so I would find a location, hopefully somewhere convenient for the dealer, and take the mechanic with you on a test drive.
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