Hi everyone ~ Thanks so much for your feedback. Sorry I haven't replied earlier. I had checked the box that asked if I wanted to be notified of replies, but didn't receive any until Don's yesterday. We determined that the problem was with the campground, not our detector. We haven't had any trouble since. Happy to know about the fuses. Which fuse would it be? (photo attached). We bought our Oliver in 2016 – Hull #125.