noise with Sonic Frontiers T3 and P3

I have a Sonic Frontiers Transport 3 and Processor 3 and they sound very well.Sometimes is audible a crackling like static electricity,it isn't continual and never in the same track time.This noise ,sometimes is also present at the start and at the end and in the pause where there isn't music.I use only original cd,and for connection I use the Is2 enhanced cable.My system is completed with a pre: Line 2,a power amp: Power2 both Sonic Frontiers ; loudspeakers:Sonus Faber Electa Amator I.Analog front-end:Mitchell gyrodec,SME IV,Benz Ruby 2 with PPI phono.
Have someone experience about this problem?
Regards,Piero Italy