How to stop International from shutting off after 5 minutes?

I have a 2013 pro star international
It recently got DEF deleted it drives fine but when you try to sleep it turns off after 30 minutes I’ve timed it. I put the brakes on and off 30 mins each I’ve set the rpms to 1000 I’ve taken to mechanic he hooked up computer they can’t figure it out any body know a solution

 

While parked pull red and yellow in if bobtail make sure your wheels are chocked you can not touch the foot pedal during this process once you have the yellow pushed in press the cruise on button and then press and hold the set cruise button and pull the yellow out at the same time you will get a message on the dash once you do it correctly there's also a high idle mode by holding the RES or + and pulling the parking brake at the same time

 

Maybe not the best answer but if it’s a company truck would only setting the trailer brakes work?

If it’s yours. Go to a dealer and reprogram

 

While parked pull red and yellow in if bobtail make sure your wheels are chocked you can not touch the foot pedal during this process once you have the yellow pushed in press the cruise on button and then press and hold the set cruise button and pull the yellow out at the same time you will get a message on the dash once you do it correctly there's also a high idle mode by holding the RES or + and pulling the parking brake at the same time