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.