Neo Smart Power Plug

NEO Z-Wave Smart Power Plug Sensor UK Power Smart Power Plug Socket Automation

Hello Bought two of these, install ok into Vera Plus UI7 works great for about a week then they stop responding
Cant contact device and more concerning the other one reports switching on and off but actually doesn’t!

I have tried removing and reinstalling several times and all the options of
Auto Config yes
Default behaviour Yes and No

Anyone had this issue