Strange clics while recording

Hello, I`ve bought my Ur28m a week ago and unfortunately detected some problem.

While I recording using mic input 1 - there appears some clicks or peaks which looks strange, and they are recorded together with my signal. They are not periodical, and appears suddenly. They always goes down and look similair .
The same happens when I record guitar with inpit1 and even when I record silence.
If I use Input2 recording is ok.
So I dont know how attach sound or picture , but when I record silence my wave function looks like this:

------ ---------------------------------------------------------- ------------------- --------
      |                                                          |                   |

I use Yamaha PA-130A adaptor, so I can consider its not a power problem.

So how can I fix the problem? May be it is already well-known issue or device is broken :cry: