New SanDisk Cruzer Switch 8GB Won't Mount Properly

I bought two brand new SanDisk Cruzer Switch 8GB USB flash drives yesterday, but neither of them will mount on my Mac. When I insert one, it appears briefly in Finder, but after about 30 seconds it unmounts itself, and gives me the message that the disk was not ejected properly. I have tried reformatting in Disk Utility but there isn't enough time before it unmounts.
I have another SanDisk 32GB which works fine.
Normally I would write this off as one bad apple, but it's happening with both the new drives..? Should I just take them both back? An extensive Google has revealed nothing of value.

you already tried all the tricks, so the last thing to do is to call Acer support service.

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