Cracked drywall ceiling - Cures?

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I have a one story house with a 60 foot hallway.
The drywall ceiling cracks whenever the weather
turns cold and wet. I think the problem is that
the framing members above the ceiling absorb
moisture and swell, and I don't think settling
is the problem (the house is seven years old).

The contractor brought in an "expert" (who did
not agree with my "expert") and extensively
repaired the ceiling four times. He also improved the
truss structure supporting the roof tiles. He put in
an expansion joint to control the stresses, but a crack
developed within 2 feet of the joint in about a month.
He doesn't have a clue!

Does anyone have any suggestions?