If it's an Amarillo, or similar model, here's the answer. I own two Amarillos. My property manager says they most all crack there. I am a contractor, so I decided to investigate. I cut down the crack line. There is no stud at that joint. It seems to me that the drywall contractor tried to save a sheet, and/or a step, and just taped the joint without securing it.
I scraped the area, installed reinforced tape, then refinished and painted. That repair lasted a couple of years. The only way to permanently repair it is to cut the drywall away to the two nearest studs and install a new piece.
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It's all downhill from here!
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