Just want to tell how Zensys Tools helped solved my problem.
I had one ZWAVE device. Fibaro Double Switch that stopped responding. Zwave repair didn’t helped. I bought a repeater , AEOTEC Smart Switch 7. Put it right next to the physical in which the Fibaro is installed with extended cable (few meters distance did not helped) . I noticed the the light became working again. I ran Zwave repair ,again, which gave good results, the problematic module had no errors . I removed the extended cable and installed the repeater in near by socket. I took a snap shot of the topology map before and after using the repeater. This is how it is look like:
No. 28 is the one that didn’t worked. I’m very happy Zensys helped me alot to trace the problem.