The access token of many users expire. My app require a offline access token. The user doesn’t changed his password. I had the same problem with my facebook account. My password was not changed but the access token is invalid.
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Facebook are deprecating the offline_access permission (as can be read here: https://developers.facebook.com/docs/offline-access-deprecation/), and so I strongly recommend that you stop using it.
Also, you can use this: http://developers.facebook.com/blog/post/500/
Do you absolutely need this? in most cases it’s not really needed.