Hard drive mounting until I try to move a file

Hi. I have a Western Digital MyBook with some data that I need to remove for a user. The drive mounts fine until I try to copy data from it. It moves a small amount of data (from 50 mb to about 200 mb). The disk then unmounts on me.
1. I tried moving the disk to a new external enclosure. No change.
2. I tried Disk Utility. It says the disk is fine.
3. I tried Disk Warrior. It says the disk is fine, but if I try to check the files then the disk unmounts.
4. Other disk utilities give me the same result.
5. dd actually got the most data off the disk, but the results were the same in the end.
Any suggestions? Thanks!

My slots are all full. I'm trying the freezer route this morning and (knock on wood) it's working better than previous attempts. Unfortunately the files are large, so I hope the drive stays cool enough for the duration. Thanks for the help. I'll keep you posted on how it goes.

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