[Nagual]

Mine is unaltered (I personally don't know what "O2 blue" is) but a design flaw exists where powering the unit on sometimes while music is playing through the Music tab causes about a 1/2-second pause and resume in the track playing. Your issue sounds worse, and one might guess that the alteration you did has something to do with it. If it's something you got from a forum post here, maybe mentioning the issue there would get you a better answer.