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First off, first post for the new truck ( '15 F150 lariat crew 5.0). Love the truck, sold 06' F350 lariat crew 6.0 and miss it but this truck is great. Now back to the question:
right before accelerating to get on highway wrench indicator light came on and noted see manual.
On high way was light on power and when I came to a stop the tranny did not want to down shift, it stayed in 3rd gear until I stepped on the gas to accelerate then there was a "thud" and it shifted into 1st.
That sounds about right for an intermittent electrical issue. Surprising they couldn't see a code though, those are typically stored for at least a few drive cycles.