Move to Puerto Rico - the car horn is the island's instrument of choice. 
I think your pants pockets are too tight and you're pressing the buttons. I suggest you find another way of carrying the fob - at least as a test. Perhaps one of those things that connect to your belt.Once or twice a week, the horn honks twice when I sit down (can be quite jolting).
The button closest to the keyring should produce honking. I think if you hit the "lock" button, repeatedly, you may get a honk. But when you say it goes off when sitting down, there's isn't much else it could be.there is no Cruze FOB button press that results in what I am hearing.
I sometimes confuse my Gen1. If I shutdown, get out, leave the door open, get back in and close the door, I'll get the "forgot your fob" honk.The triple honk is the "left key fob in vehicle" honk.
I'd suggest taking a hard look at how you're handing the remote. It's range can be quite impressive. Mine works from my apartment though two floors of cement slab and rebar. I know, because if I press the lock button I'll hear a honk from the garage.Possibility related new feature - about once a week, when I return to my car after work, it is no longer locked.