I had the same problem with the DSC06106-ZWUS. I wrote a SmartApp (a combination of the BetterLaundryMonitor from @sudarkoff and and the Pollster SmartApp from @geko) called Yet Another Power Monitor. It keeps my Aeon Labs Z-Wave Smart Energy Switch from going inactive.
I am trying to write a better DeviceType for the switch that might better solve the problem.
Good luck.