Headphones Out problem

[pincur]

Hello all,
I would like to present a little problem with my Virus TI Desktop.
When I connect Headphones Out of the Virus into Line-In in my mixer, I can hear some clicks on left channel (especially on arps/seqs with short attack).
What is worth noticing, these clicks don't occur on any Virus'es Line Out and don't even exist on the right channel of the Headphones Out.
When I use headphones connected to the Headphones Out, I don't hear any clicks.

I just would like to know, if it is a hardware issue of my Virus...
Signal isn't distorted overall, just these clicks on the Left channel.

Would anyone be so kind and make a simple test on his/her Virus?
I mean, could you please connect your Virus'es Headphones Out into some mixer's Line In and check if there are some clicks on the Left channel (especially when the master knob is on 70-127).
All the best,
Peter