UPDATE
The reboot trick is not working for me, at least not consistently, so it’s not a proper fix. After twiddling about a bit, I’ve finally found consistent charging by ensuring solid, continuous contact in the charger.
If I place my HAs in the charger firmly, then rock the tops (receiver wire end) back toward me, that forces the pins on the HAs into good contact with the charger terminals. Release gently, plug in the charger, and I get a consistent, reliable charge.
I think the issue here is both hardware and software. If the connection isn’t secure, something as minor as temperature drop during the night might allow one or both HAs to shift, breaking electrical contact. The other part of what’s messing with people is that the charging progress indication continues to rise, even though charging has stopped. That’s why I was seeing full or near-full charge when the HAs were in the charger, and something much lower, maybe a bit higher than where they started, only moments later when I took them out of the charger and they activated for use.
That means that, while it’s handy to be able to check charge level while the HAs are in the charger, you can’t trust the reading. It’s been consistent and accurate for me since I’ve been doing the press/rock/release routine. But that routine depends on friction to hold the HA contacts against the springy charger terminals, and that friction may fail to hold after wear from many insertions.
If/when that time comes I might start playing with toothpicks or something to wedge the HAs in place during a charge. Or give up, turn them in before my trial 180 days is up, and go to a different brand. Not sure I want to start that kind of project again. These are my first-ever HAs, the KS10s are working fine for me, and I understand their Bluetooth functionality is hard to beat.