I am wondering if anyone has looked into the suggestion of @vincent (earlier in this thread) that
it was not moisture as such, the problem, but salt one.
I have had one situation where I started getting erratic notes. I swabbed down my fingers and all the finger pads on the Sylphyo with a slightly damp cloth. It worked immediately and completely to resolve the erratic behavior. However, since it was only a single test, I have not reported it before.
In other cases of erratic notes - they only happen when I first turn on the Sylphyo and I usually just "wiggle my fingers" for maybe 5-10 seconds and the erratic notes disappear and never return during play.
Would love to hear if other have experimented with this ... as @vincent points out, erratic notes could be a real show-stopper ...