Before I saw this post about turning off the TV (and not sure what effect that would possibly have on the cable converter), I decided to turn off the converter itself. Waited 30 seconds to let the HD spin down, then restarted. Then, very close to the box and very quick on the ExitX3. It worked.
I had lost the capability, btw, after the box put up a message that the remote's batteries were low and I replaced them. Great help on the forum.
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