Be sure you're not working with an acidized file. Or if you are, turn it off.
Also check your bit rate and be sure the file is the same as the DAW is set for.

Both of those things can make files wonk out and it'll drive you crazy trying to figure out what is happening.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.