continuous alexa errors and hub stops responding

Getting hundreds of these errors:

Followed by these errors:

Devices take minutes to respond. It just started after updating to .121 from .119.
I'm rolling back.

Nevermind. I tracked it down to what appears to be (and hopefully it is) a bad z-wave plus dimmer. Of course, it's a z-wave device. After all, I only have about 12, versus the 150 or so Zigbee devices on the mesh. The load on the hub went to 96.5% and stayed there until I disabled it.

Well, I spoke too soon. Woke up to my zigbee radio offline. @gopher.ny , can you look at my hub?