Cheap DAC working well

[Feanor]

thanks for the reply....
winamp and VLC showing the same problem let me check other software..
i just found that disturbance in the main (AC) Supply, ie, devices plug and unplug causing the same problem..

it working good when using Optical input (sony Tv/DVD player), but my pc
doesn't have optical out..

i need PC to play my wav or flac files ( i Have large collection)

I'm wondering why it is that you need to turn off you amp while you computer music player is still running? If you shut down your music player then switch off the amp, then when you turn on the amp back on and then start your music player, is the playback still frozen?