The best advice is to hire a professional to look at the house and answer your questions.
It sounds like the subgrade may not have been properly compacted in the garage before the concrete was poured causing the slab to settle.
Cracks could be common cracks or from movement or foundation settlement. A CERTIFIED home inspector or structural engineer should be hired to look at these problems and answer your questions.
The crown molding problem could likely be from wood and/or caulking shrinkage which is fairly common in new homes. Cracks in the walls would also be present if the problem was from a settlement there.
Glenn
Moderator: Construction Systems, Foundations, and Masonry & Stone
For more information about me, my qualifications, and/or home inspections please visit my website at:
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Moderated by Glenn Good 
