You’re not alone, but this is not supposed to happen.  If the plastisol ink (truly a plastic) is cured correctly, it will behave much like a rubber band.  When pulled apart it should stretch without cracking.  Of course even rubber bands break if you stretch them too far, so proper curing does not solve reckless behavior.

The problem is that some screen printers have small electric ovens for curing.  There simply is not enough forced circulating air.  To do a great job of curing the ink you need a screen printer who has a gas oven with forced air on the top and bottom.  This way the ink reaches its curing temperature on the surface and the underside, thus curing the ink at all layers.  By reaching the correct temperature the ink is fully cured and can then stretch without cracking.  Your imprinted shirts can last until you wear them out.

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