My 2018 Thor ACE does that, too. I actually don't like the side cameras at all and am going to unhook them. Fortunately for me they connect right under the access panel in front of steering wheel. I prefer using the mirrors themselves and find that looking over to the radio is a distraction while turning / changing lanes. Plus, I like to leave the rear camera on so I can watch our Jeep while driving... but every time I use a turn signal, I have to tap around on the screen to get the rear camera back on.
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