Unconditioned Spaces (no HVAC) like garages experience expansion and contraction as both temperatures and humidity levels fluctuate. As already stated, the cracks will continue to reappear unless fixed with a flexible joint compound. We have cracks in our garage as well and have chosen to ignore them, they are purely cosmetic. I would rather spend my free time golfing, swimming, bike riding, fishing, etc.... if we ever decide to sell the house, I will fix them.
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