I got a response from Labradar. First they asked what external power source I used, the model number and make. The one I used has 2 USB output @5V each and micro USB for charging port. Sent them a picture of the unit, have not received the follow-up response.
I fielded the question as to why the input DC voltage is such a big issue, when lots of companies clamp the input through lots of schemes. No answer.
I retired from the semiconductor industry, I know all the microcontrollers we produced, for example, all have voltage input protections in the design.
I don't know how long will it take for Labradar to fix my unit once they receive it. In the meantime, I bought a Magnetospeed V3 today as I need to do some load work on a few rifles. Though not a must item for load work, just an added data.