Power cycling had no effect on the behavior. I noticed if I open the device page, the on command acts like a toggle and the off command doesn't seem to work at all. Now that I think about it, I think it started acting up about the same time as the zen30 I posted about here Pretty sure my switch needs replacing. Any troubleshooting steps I should try that I have not thought of?
So I'm wondering if I had a surge or something that damaged them. Both devices are among the very first I ordered when starting though, so I'm wondering what this means for the longevity of my switches, which are all Zooz.