I finally had a chance to install one of the aux switches i bought. I went from a dumb 3-way to aux. I followed the wiring here, i’ve included both the old and new. the aux switch turned the light on once, then the second time it killed the switch. i opened it and its toast.
I’m guessing you don’t, but do you have any pictures of how the aux and the switch were wired before you tucked them back into the box? There are a couple possibilities here. One is the mis-wiring, the other is some issue with the aux. It’s a little tough too rule out your wiring if we cannot see how you did it. I can understand, though that you wouldn’t necessarily have taken pictures because you would not have expected this to have happened.