The cord seems solid at first but if you have to move the tetra it will shift and cause problems. The top retention clips on the cord tip do seem to be working, you can feel and hear the cable seating.
I've tried with a different, brand new, Anker micro USB cord and get the same effect. Just seems like the port is 'wider' than the tip thus allowing it to shift.
Just tested both cables in the UART port with the same results.
You still have to apply pressure to remove the cable, as expected, but it's the side to side shift that's a problem.