Asked on Sep 29, 2017
Why does my grass have soft spots that feel like it's going to sink?
by
Pam
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Most likely mole ,voles and gopher infestation which has been a very badd issue this year
This site seems to have some good advice.
http://homeguides.sfgate.com/fix-mushy-areas-yards-52201.html
It could be moles, or another ground creature. Here are a couple things I found
http://web.aces.uiuc.edu/urban/macon/inout/020317.html
http://www.yardener.com/SolvingLawnProblems.html
If that is not the issue, here is another posibility https://www.gardeningknowhow.com/lawn-care/lgen/lawn-thatch-control.htm
Moles or gophers? Do you have a septic system?
Perhaps air pockets evaporating.or scrubs eating away roots of grass?
It sounds like you have mole runs through your lawn. Or other burrowing varmints.
You may even have underground water seeping up. Contact a lawn company to inspect your yard. Better safe, than sorry.