Re-visited the problem with the Power Plug (now dual-port USB) and intermittent voltage. Found a crimp problem at the VP-X connector end of the wire J10-2 which was crimped on the insulation of the wire, and not the wire.
Removed the terminal, stripped, and installed a new terminal. Tested good under flexing, and re-inserted into the VP-X. Test shows 12 VDC to the USB plugs leads. Needed this to work for sustained support of the X-Naut and iPad as a minimum. Longer Phase 1 flight times in the summer require good power and cooler.