On a couple occasions ours has done the same thing. A clever mechanic friend of ours suggested we take the cover off and watch what it was doing during a search. We discovered that this unit needs a clear view up wards as well as to the south and if it can't look straight up it seems to look around for awhile and then get locked in that looking up position on occasion. I would remove all the screws and lift off the plastic dome. When you do this look and see if the horn is pointing in the straight up position, if so just give it a pull down so to speak to unlock it from it's current position, re-assemble and plug it in. Hope this works for you.
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Darwin & Maureen DeBackere
Minnedosa, Manitoba, Canada
2011/3500/Silverado/4x4/DRW/Duramax
2017/3721RL/Legacy Pkg./Pressure-Pro
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