Inovelli red in 3 way not turning off in one position

Hello, so out of the blue, I have one of my red dimmers not working correctly. It is wired with a dumb switch, in a 3 way configuration. Wiring is correct.

light on from dimmer, then turn off on dumb switch, good.
lights back on from dimmer, good.
light off from dimmer right after, nothing. The led bar goes off, but the lights remain on, and I don’t hear the relay click.

I’ve deleted the switch, factory reset, re-added, twice. The 3 way setting are correct.

I’m at a loss.