NEO coolcam goes offline, store kwh in plug?

HI. I HAVE AN neo Coolcam z-wave plug in socket ( controlversion 2.2.15-4) that suddenly went offline. It has been online for several months. Just 2 meters away i have an Aotec energy meter z-wave that works like a charm.
My hub is samsung smartthins software 000.041.00009.
Now several hours later it is back online again buy it self?
I dont know if the plug has gone offline more times under these months but while offline, will the socket store the energy consumption in the socket and registrate that energy when it goes online again, or will the energy be missed while offline?