I'll report back on my test results after the weekend.
I rode a long distance yesterday with the 3.1x16 firmware.
https://mrbill.homeip.net/bikeBlog.php? ... 2017.05.28
The original problem of the AuxA Pot screen appearing randomly when the AuxA pot is not being adjusted did not manifest itself with the x16 firmware. I do notice that I have to turn the pot a bit further to get the screen to appear, but in practice this is not a problem.
I did observe a new problem that I describe in some detail in my blog entry linked above. (Substitute "CycleAnalyst V3" for "computer" in the blog.)
The short version is that I had several instances of the CA3 showing hundreds of amps drawn while I was on my ride that I was only able to clear by cycling power to the controller and/or unplugging and re-plugging the CA3's 6-pin JST connector that includes the shunt sense wires. The problem reappeared several more times during the ride, often during or immediately following a long session of powered riding or regenerating, sometimes in combination with rough road conditions.
The next day I attempted to observe the problem on the bench. I placed a dummy load (power resistor) of 8 Amps through the shunt, then without disconnecting them I physically manipulated both* CA3 6-pin JST connectors. Squeezing the connector closest to the CA3 that I had not exercised during my ride caused the high amp reading the appear. I then unplugged and re-plugged that connector after refreshing the dielectric grease on the pins. Since then I have been unable to elicit the spurious current reading when using a dummy load.
I will continue to monitor for a return of the problem.
In light of the fact that I had not touched the "upper" CA3 6-pin JST connector recently and that the only other significant change was the uploading of the x16 firmware, I have to wonder if the the x16 firmware increases the CA3 sensitivity to noise on the shunt circuit. Does it?
*Because my bike has long cable runs I added a second 6-pin JST CA3 connector near the CA3 head so that I could easily remove the CA3 from the handlebars without removing the entire length of attached cable from the bike.