Thanks for the advice. My reference to reset was indeed using the restore setting on the unit's sub menu. I have one more thing to try: in between the first successful write-to-scanner with favorite lists, I switched cables. I wanted a back up cable so I got one off of....Amazon. Always top quality, right? The cable that came with the scanner got stored in the box and I used the Amazon substitute since it was a little longer. I know with ham radios USB cables are not all created equal. Even though the connectors might be the same, sometimes the pin alignment on the chinese aftermarket cables is just not 100% correct. SO...the next Sentinel session will be with the USB / mini USB cable that came with the SDS100. It'll be interesting if that is the fix. The substitute would then go to the car for charging only.
We'll see. I'll post the outcome when I can. Again, thanks for taking the time to look at this.
Cables......
For a 100, the main thing to look for is AWG24.
This gives you heavier power wires to prevent the low voltage error.
https://www.amazon.com/gp/product/B003L1380E/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1