Noise from my brand new Eleven Rack

[zuriain]

First of all, sorry for my bad english. I'm writting from Pamplona, Basque Country and english is not my native language.
I have just received my 11R purchased from German Thomann music store... and I`m very dissapointed with it: It makes a lot of noise with the high gain settings. Is not a little hum or hiss.
When I touch metal parts of my guitar (strings, bridge, pickups, machine heads...) or the Eleven (on/off switch), electric cracks and terrible noise happen. I can feel the electricity running on my fingers! If I don´t touch the guitar or the Eleven, there is no noise.
It happens especially when I play notes sepparatelly or when the sound is dying out, specially with some high gain amps or settings.
I've tried with my two guitars (Ibanez Rg, Gibson flying V), several cables, headphones, monitors, connected to my pc, not connected... but the problem is still there.
Well... I hope somebody can help us. I´ve written Thomann store to report the problem. I hope they send me a new one...
Sorry again for my bad english, and thank you!