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EVMK2H: Issue powering up the board

Part Number: EVMK2H

One of two EVMK2H's we have is not powering up correctly, after making required modifications and UCD updates.  The unit runs for a short time (a minute or so) and then we get the following on the display "SOC PWR Stop Complete".  

After rebooting a few times, it ran some example programs, but eventually we get "Main PWR Stop Complete".

We've also noticed the serial port dropping out periodically.

It seems to run more reliably after it warms up.