Hi Deadcalm,
I had the same streaks a week ago. I have seen several Gulfstream 4s or 5s which seem to have tweaked their boxes to hide their identity presumably. There are several different ways in which this is done :
Method 1 : The flight trail shows on the map with the flight tag cycling on and off every 3 seconds.
Method 2 : The flight trail shows and the flight tag cycles on and off in a random pattern. At the same time the flight level is flipping between the apparent correct level and a spurious level. Examples I have seen would be along the lines of : Actual level FL 400. Spurious level FL1210 ! or Actual level FL 400, Spurious level FL130.
Method 3 : The one you saw where the aircraft position is flipping between it's actual position and a distant position. In the case I saw it was flipping between North Atlantic airspace and Brazil !! I got a bit of a fright when I saw it happening as I thought the program was in the process of crashing ! The RB software works very well in plotting the information it is receiving :)
With methods 1 and 2 I have seen the aircraft flying over the North Atlantic with a steady flight tag but as soon as they make landfall the erratic behaviour starts.