Premiere corrupted the audio track of XDCAM EX

I am very new to Premiere. I received a file from a friend who wants me to convert the video to NTSC DV widescreen. I imported the MP4 file and added it to the timeline. I was able to convert fine with exception to an aspect ratio issue. So, I decided to try again. Much to my surprise I find the audio track is corrupt. The first part of the track is fine except with occassional pops & cracks, then after about 10 minutes the entire audio track turns to peaked white noise? I checked the modify date of the source file and sure enough it has changed. I did not tell Premiere to overwrite anything and thought it woudl not alter source files. How can this be? What can I do?
Thanks.

Thank you all for your help. What I ended up doing was create a new project and import the entire BPAV directory. However, after conforming, there was still one clip's audio track that was corrupt. So, I decided to create yet another project and inport only the single troubled clip. After conforming the audio track was still corrupt. I did look at the audio tracks closely and they were corrupt in the same place. (eg. the beginning of the track was fine and then suddenly at a set point the track would go bad). I know it is not a bad file because Sony's player plays it fine. So, I did some checking and found the "Media Cache Files" folder. I blew the contents away, recreated another new project and imported the troubled clip. After conforming I find the audio in Premiere is just fine. The media cache files were taking up a lot of space but had not nearly filled the drive. What ever it was I'm glad there is a forum like this to help us new users.
Thanks again,
ISTMAN

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