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too much water
It may actually be inconsistent watering. Tomato plants need to get the same amount of water consistently through out their life to do well. If you water them differing amounts, or you get a hot streak, or you get a dry spell, or you get downpours for days, (you get the idea) they will crack.
Tomato Cracking is usually from excess rainfall, or from hand watering from the top of the plant. Tomatoes prefer to be watered at the bottom, ie, drip line, bubbler, running hose, etc. Watering from the top during the day, makes the tender skin crack from the excess heat, (it's like basting them) and watering from the top during the evening can harbor or otherwise encourage diseases of various kinds to take hold.
Water the roots, not the plant for crack free tomatoes.
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