I don't have a solution for you, but I will add that I (sort of) have the opposite problem. My battery frequently shows a zero percent charge when it is fully charged... even when plugged in. This began a few months ago... not after the last update. I mostly use the AVP when plugged in, so I just ignore it. This would obviously be a much bigger problem for people who routinely use the AVP with an unconnected battery.
I know this doesn't help you, but there seems to be an issue with the battery charge level indicator. Fortunately, this is the only problem I've had with the AVP hardware since getting it on day one.