Have you isolated the issue to the Windows IoT?
According to the Intel® System Event Log (SEL) you provided, there seems to be a processor error that could be generated by a program or by a faulty processor which is causing Windows to do a System repair and prompt for reboot.
Is it possible for you to test another processor on the board?
I have 5 units exactly like this one, and I have the same issue on each, so I do not think it is a bad processor. Windows 10 boots UEFI, do not know if it is part of the issue. I have loaded Server 2012 on the unit and it works fine. I can reboot over and over, no issue, though Server 2012 is based on Windows 8 OS, which is not the same as Windows 10. I can use the Windows 1o on the S1200SP motherboards we are using with no problem.
We are going to test the OS on the unit and provide feedback as soon as possible. Let me see if I can run the same setup in my end.