I have never had the power steering issues, but one time I pulled into a parking lot and did not notice they had triple speed bumps all about 6 inches apart as I was distracted by kids in the back seat, anyway I hit this trio of bumps at about 10 MPH and the truck cut off, same way you are saying as if someone turned the key back so the power was on but the engine was killed. I had to manually turn the truck back on. I checked the dash grounds and they were fine, no sound deadening was under the bolts ( wonder if that was a 14 only issue) and I also checked my battery terminals also good. A few other times after that when going over bumps, all my dash lights and mylink screen would cut out then come back, engine would cut out for a split second then come back. I once again torqued down battery cables and its been a few months now without the issue. so weird. never threw a code.