Sinking holes in lawn
We have been in our house for almost 2 years. Our builder did not do a satisfactory job of putting in a lawn, so the first fall we were here, we had a garden center bring in a Bobcat and work out the lawn and reseed it. Back last February, after a hard freeze and thaw, a large hole (3 ft. by 2 ft. by 2 ft. deep) appeared in the ground and the grass sank into the hole. The garden center refilled the hole and reseeded, but they did not know what caused it. This fall, after a drought summer, we have received a great deal of rain, and the hole reappeared in the same place. On top of that, two other holes have appeared. They seem to be in a line, several feet apart.
What could be causing this? Is it dangerous to our home? Is there any way to stop them, other than continually refilling them? As far as we know, we are not over a covered river or stream. It doesn't seem to be happening to other homes in our neighborhood.
Help!
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