When we had a Roadtrip (we have since installed a Trav'ler), once I had a good signal on the TV, I turned the Roadtrip off so it wouldn't start searching again.
John & Doris Doris and Robbies Blogs 2017 Cedar Creek Cottage 40 CCK FMCA F380583, PA, Good Sams
How long are you allowing the antenna to finish it's reception fine tuning? It is not unusual for a Winegard Roadtrip to take 5 to 10 minutes to fine tune its positioning and stop searching after acquiring and locking on a sat signal.