Long static question. Sample echo and glitch

Hello I am trying to play a long static sample of a book on tape that’s about 40 min to use in the background of a noise set I am playing. The problem is that the further into my set I get the sample starts to kind of repeat the words and get glitchy and I want it to just play normal and unaffected while I use my modular. Has anyone here experienced this issue? I have nothing going on the track that I can see would be causing it any suggestions would be appreciated.

Figured it out when I converted it to wave the sample got corrupted. Fixed and all is well now.