Sylvania Smart+ Outlets - might anything in the release have impacted these?

(This post is probably in the wrong place. Moderators are welcome to move it as appropriate.)

Never had these messages before today. They appear to involve Sylvania outlet(s) based on their timestamp and the Zigbee activity log for the device?

EDIT: ah ha !

So now...I have had this suspect outlet in operation for a couple years now...but it just so happens to be in a REALLY HOT garage right now. Hummmmmm

EDIT: Nah, it's not just that Sylvania outlet that is prompting these messages. There are two others in cooler environments. Furthermore, these are some of the most chatty devices in the mesh. Message count is significantly higher than other devices and it's not an energy nor temperature monitoring plug.