Answer: It does sound a little suspicious, doesn't it? If moles or voles are tunneling under the root system of your turf, that would explain the damage. These critters love to feed on grubs. About the only way for you to know is to dig the affected lawn and inspect the soil. Just take your shovel and plunge it straight down in a line at the edge of the lifted turf, on three sides. The goal is to be able to roll the lawn up so you can look at the soil and the roots. You may find a gopher or mole hole, or you may find a mound of soil from a hole. If so, you may want to set a trap in the hole or tunnel and then cover it up with the turf to exclude sunlight. If you don't find anything when you lift the turf, dig out or add some soil to make the turf lay even with the rest of the lawn. The roots should penetrate and knit the soil together to eliminate the odd appearance above ground.
Best wishes with your lawn!
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