Glitch with PowerMeter (drop of instant energy usage to zero)

Hi all,

I have pretty strange glitch with my wall plug. 3-5 times in an hour it reports drop of instant energy usage to zero, and immediate return it back, but device itself works without interruptions (my computer). This leads to execution of both scenes “usage below”, “usage above”.

In logs it looks like that (the second record is 2 second later than first):
[size=8pt][font=andale mono]06 05/23/18 9:33:34.066 Device_Variable::m_szValue_set device: 5 service: urn:micasaverde-com:serviceId:EnergyMetering1 variable: Watts was: 56.6 now: 0.0
06 05/23/18 9:33:38.066 Device_Variable::m_szValue_set device: 5 service: urn:micasaverde-com:serviceId:EnergyMetering1 variable: Watts was: 0.0 now: 57.6[/font][/size]

I use Vera Plus + TKB plug TZ69G .

Is it a known bug?
Is it bug of Vera or Plug?
Does someone managed to overcome this thing?

I had to write my own proxy watcher, which filters out such “pikes”, but it doesn’t look like good and stable solution.