Yup! It was a cell interference issue. When I put my phone near it, I would hear the noise and when i take it away it goes away. Or, when it's near and the noise starts, if i bring it closer it gets louder. seems like I'll be keeping the e10, the udac2 is too expensive for the sound quality. Thing I don't understand is why the e10 has the cell problem but the udac2 does not? Is it the materials it's made of?