unsupposed crash

Everything was ok until SOME time, i don't know how it caused. Was playing in normal mode, without input, one channel output, in the middle of the track began buzz like cd error or smth like... then I played from other PLAYER. in crash folder there is nothing... how to be? maybe it's caused by 4g modem? who knows...
or by soundcard esiu46xl - I don't know.
help please

help please