This would also suggest a z-wave radio specific issue.
There are a few things you could post that would help:
The full content of you z-wave details page as a screenshot.
Download/install @tony.fleisher's z-wave mesh tool, and post a screenshot of the Z-Wave topology with and without non-repeaters being hidden. The native topology map doesn't give the option of hiding non-repeaters.
Under Logs, screen shots of your Device Stats and App Stats.