Playback Audio bug

My playback audio on audio files is being significantly reduced in volume. Audio mixer is showing -15 to -30 db even though I haven't adjusted the volume on the file in the sequence. Occasionally, I can remove the file from the sequence and then just put the same file back into the sequence, however this only fixes the problem temporarily, as the volume fades out to nothing again (not to mention having to re-do all of the work I've spent on that file.) The files work totally fine on other media playback softwares.