Engine shuts off while driving

Hello, sorry to hear about your issue here. What Sub-model is this vehicle? Express, Heat, Mainstreet, or Uptown?
And does the vehicle still crank the engine over when it quits on you? Just doesn't start?
If the vehicle still cranks the engine over, just won't start, it sounds like the Crankshaft Position Sensor may be a fault. It's a common issue on these vehicles. I've put up some diagrams and other information to help you to check the sensor. Plus, some guides to wire testing.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

Oh okay. I'm posting a diagram just to show you a specific module. This is called a TIPM (Totally Integrated Power Module).
These modules have been trouble ever since they first put them into vehicles. I have seen and heard of more failures of these then I can remember. As much as I don't like to recommend the dealership, if that's where you're most comfortable going to. Unless you know a real good shop with honest technicians. The dealership usually charges a lot more.
But what you're experiencing sounds like the main ECM (Engine Computer) may be losing power, or a relay that powers up the ECM may be at fault. This will be a tough one to diagnose because a technician will have to catch the fault happening to find out what component is causing the stall out.
If you know a good shop, you may have them take a look at it to see if they can find the fault, I would think it might be a bit cheaper, but that call is up to you,

If you do bring it to a dealership, I wanted to advise you on two recalls for this car.
The first is an issue with the Steering Column (Pics 2, 3, 4).
The second has to do with the Airbag deployment system shorting out. (Pics 5, 6)
Just wanted to make sure you were aware of these 2 because they are safety concerns.
I'm sorry I wasn't able to help you more. It would take a lot of testing and special equipment to catch the issue. I hope this information helps.

Let us know what it ended up being. We like to see a close to diagnostic issues.

The rear sub frame huh. Not what I would have expected, but after so many years of doing this, anything seems possible. Was it rusted out? Kind of strange for a 2011 vehicle. You possibly live in an area that they use a lot of salt on the roads? Thanks for the update though, appreciate it.

I see, I lived in Jamestown NY at one point, I remember all the rusted-out vehicles up that way. We would call it the rust belt. Good thing they caught before it came apart on you.