Does anyone have any insight into why our 2019 Santa Fe Cruise Control will not hold its speed. It happens on flat, clear roads with no cars in sight. For example, it'll regularly hold between 2 and 10 mph less than what it's set to at multiple different settings. This happens intermittently and varies up and down as you're driving without traffic around. Dealership told us this isn't normal, but insinuated it's "user error."