I've spent a lot of time carefully mixing a track with NCH Mixpad. Once I felt it was completed, I exported it to a .FLAC file. While listening to it, it sounded good until towards the middle of the track it suddenly went blank then came back on again towards the end. What could be causing this? I went back to the tracks on the mixpad to make sure nothing could be causing it. And it plays all the way through just fine on the program but continues to go blank in a specific spot wheneve it is mixed down.