Noise level problem

Hello I bought a second hand digitakt (that was looking clean and fresh) and I realice that if I turn the master volume knob more than 50% or 55% start to distortion a lot, and if I have the digitakt turn on but stop and I turn the knob to the maximum a huge white noise start to appear

Anybody know any solution?

Thanks

Edit : I was doing some test, and I realize that on the output for the phones it’s almost inaudible the white noise when the the master volume knob it’s to maximum but on the left and right output it’s kind of disturbing when the knob it’s all the way up

That doesn’t sound normal.