On Brad’s instruction, I disconnected everything from the network, leaving only a laptop (for ElkRP2 use with a wired connection) and the XEP. Elk RP2 connected well and stayed connected. I then brought each device back on the network one at a time starting with wireless, as I considered those more unlikely to be the cause of any network disruption. I paused between devices, monitoring the connection between the laptop and the XEP. It remained stable. I then did the same with the wired connections, but stopped when I had connected all my known/labeled cables. The connection remained solid. I now suspect a bad cable or connection on one or more of my unused runs.
New ping data looks great…
Packets: Sent = 10, Received = 10, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 2ms, Maximum = 4ms, Average = 3ms
I consider this resolved. Thanks, All!