So, does this happen when you first launch the boat at the beginning of the day, or does this occur after you have engaged the cruise but then turned the toggle of the cruise to off but did not shut down the boat. If it is the first issue, then you have a problem. If your scenerio is the second, I think I have had this happen.

Mostly, I leave the cruise on and turn the engine off. When restarting the engine, the cruise is now set at idle until I reset it.

Hope this helps.