The Rample used to have an issue with some sort of header information. This had to be stripped out. Ableton would include it in Exports.
Historical Information: Sample Transfer
Although the manual seems to state you can use Ableton (which I don’t remember it stating before…but it’s been awhile since I’ve read that section (1 year at least?)), I would suggest stripping the header info off if you have that capability to test it out. Audacity or mp3tag work (I use the latter for bulk, former for single files, because: reasons).
Also: Are you using the latest OS?
Another option might be data corruption, but if you’re making new files I’m not sure this would be an issue. If you have the original audio files (or don’t use/want them) and have been through the process of reformatting your SDCard, reloading the latest OS, reloading the audio files.