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I also have the mx4 and it works fine. Both boxes open. The thing is it’s not a perfect fit on mine and the dealer says it’s a ram box thing. The rubber gaskets aren’t overlapping enough and usually one side will require you open and close the entire tonneau after opening the short sided rubber...
I had the same problems in mine. Started about a couple months after buying it. I ended up factory resetting the connect system at the advice of Ram and so far it seems to have corrected the problem. Just be prepared to reprogram everything.