If your seams are really that wide, something has settled a lot. The garage floor is poured as one solid piece of concrete. Than after about 12 hours they use a concrete saw to cut those seams to prevent cracking. So they started out the width of a saw blade probably around 1/8 of an inch wide. You may get some settling and they open up some, but if they are 1/2 inch or more there is a problem. If a new house call warranty, if an older home might want to get someone in to check the structural integrity of your foundation.
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