Islam while 3d printing, the extruder stops suddenly for a while and then resumes working again normally in all layers (not only first layer)and the nozzle leaves some spaces without filament as shown in the image
Repetier Could be not enough force so it stalls. Maybe temperature is not high enough so it can not put new filament through until it is melted a bit more. Could also be overheating of stepper driver so it pauses until cool again to extrude.
