It did it again and this time I was watching for the door locks, and they do not lock and then unlock when the issue happens. I cannot see the dome line from the drivers seat while driving, and because this issue has occurred in the day time only so far, I cannot tell if the dome light is turning on and off. The dome light does work fine when I open / close the door. The seat does not move on it's own either, so my issue seems to be slightly different than the rest of you in this thread.
In my case it's seems to be an electrical issue that cuts power to the engine (it acts like it wants to die so it must be losing power to the ignition coils), dash cluster goes completely blank for the digital panel and gauges (the speedo and tack continue to work, but they are analog), and radio goes blank. Then one by one it comes back, first the engine returns to normal, then the dash lights come back on and then the radio turns on / boots up as if you just started the vehicle. There is no obvious cause, meaning it doesn't happen when I hit a bump or pothole, or only when raining, etc. There is no reason or rhyme to it. Sometimes it happens 50 feet down the road when I leave my house, other times it happens when I'm 10 miles from my house on the freeway. It's totally intermittent. I really wish that what ever is failing would just fail and die so I can find and replace it.
We did test the battery and it is good. We also confirmed that the new alternator voltage when running is good.
I do have one other issue that may or may not be related. The airbag light comes on sometimes when I start my truck, and stays on until I turn off my truck. Most of the time, it is only on for a few seconds after I start the engine. Even when it stays on, I can turn off my engine and then back on, and most of the time the airbag light will then go out like it should. I had Ford check that while I still had a warranty and they said they found a lose connection, and fixed it. I didn't see the airbag light again for several months. So I don't know if the Ford fix didn't hold, or if the airbag light is related to the electrical cutout issue, or if that is a separate issue altogether.
Given what I have read here, I still think the next step in troubleshooting this is to replace the ignition switch and see if that resolves it. The problem is my issue is intermittent, and I never know when it will do it. In driving an entire month, it only had the issue once. That said, I have a very short commute so my truck runs for less than 10 minutes going to work and then another 10 min going home. Perhaps if I had a longer drive, I would see the issue more often.
Unless there are other suggestions, I will order the ignition switch. I'd also like to hear from anyone who is having the same exact symptoms as me.
Thanks!