I got my TX802 today and am experiencing exactly the same thing.

I am using both a Roland JV-1080 and Yamaha TX802 with Logic Pro. The JV-1080 is behaving perfectly, but whenever I select a track the TX802 immediately shows a 'Trap Error' and gets stuck as described.

I thought it was the battery (as my battery was dead and the unit was behaving erratically), but I replaced the battery this afternoon, but the Trap Error remains.