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Update: I never got around to updating what happened. When reinstalled for third time it now works. Even though Pioneer states nothing was done to unit, it appeared to have a software update of some kind. I noticed that the contacts were sorted differently, my startup image was changed back to the original one, etc. So something they did to it seemed to correct the problem. I have had no troubles since.

Here is an update: I shipped the unit back to Pioneer again (2nd time). I sent a video along that showed the behavior of the unit rebooting after the vehicle reached about 10 MPH. This time they claim to have driven a vehicle with the unit in it for 25 minutes and did not have any trouble. So they shipped it back to me. At this point they are saying it must be an installation problem. So I have an appointment with installer to put it back in and try to figure out what the problem is.

I have been experiencing a similar problem with an F900BT. It worked fine for about the first two weeks I had it and then started rebooting constantly. Called TS and they said to ship it in for repair. I got it back the next week and they said no trouble was found, it ran all day. Once the AVIC was back in, as soon as I started driving it started rebooting again. After several more calls to TS I believe I have it narrowed down that it only reboots when the vehicle is traveling over 10 MPH. If I'm parked in my driveway it works fine, which is why TS didn't find anything wrong.