I posted my experience with this issue in the other thread:
http://forum.micasaverde.com/index.php/topic,36482.0.htmlIn summary, the conclusion I have come to is that there may be a hardware issue with the Z-wave radio receiver in the Vera Plus. It is either extremely insensitive, or the Zwave network is not able to route commands effectively. If it is a hardware issue, it probably won't get fixed with a software update.
I started with a Vera Lite a couple of years ago. Before I purchased it, I also purchased the parts to add an external antenna and did the mod right away. I have many battery powered devices and have never encountered a problem with them. Perhaps the added antenna helped with the Vera Lite. I don't believe that it is a simple matter to add an external antenna to the Vera Plus and have not looked into doing it. I pre-ordered the Vera Plus before it was available and have been running it ever since it was released. I have always had the "Can't Detect Device" error. I am reluctant to upgrade the firmware on ANY Vera device, I have never had a problem free firmware update. Currently I am running 1.7.1754.
My solution/work-around is to use an Aeon Labs Aeotec Zwave Extender/Repeater. It is $28 dollars on Amazon:
https://www.amazon.com/gp/product/B00K7QZUZM/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1I believe the reason it works is because the weaker devices are able to talk to the Extender/Repeater and it in turn relays the messages to the Vera Plus. I have been using the Extender/Repeater for 3 weeks now and ever since adding it, my system has been error free. Previously, I had ALWAYS had a problem with the "Can't Detect Device" error. Nothing I had tried up until now has worked. Within a couple of hours of adding the repeater, I finally saw the Dashboard's System Status with a

. I have a small one floor house with a basement and a bedroom located in the attic. The Vera Plus is located in the center of the house on the first floor. The Extender was added in the basement and is located only about 10 feet below the Vera Plus. I imagine that in larger houses more than 1 extender may be required, perhaps one on each floor.
I would be interested to hear from other people that either already have an Aeon Labs Extender or users that purchase it to add to their systems. I have no affiliation with Aeon Labs, I am just a happy customer.
-bob