The torque or fastener spec could just be wrong in the face of unforeseen resonance or some other in-flight oddity cumulatively loosening the bolts. I wouldn't

The torque or fastener spec could just be wrong in the face of unforeseen resonance or some other in-flight oddity cumulatively loosening the bolts. I wouldn't be so certain it's installation error or mfr defect of the fasteners...