External Drive cannot be read by my computer!!!

I bought a SanDisk 2tb ssd to unload my current 500 gig drive that was getting full. I moved a bunch of files over to the new drive after formatting it to Apple apfs. It worked fine for two or three days. Now, when I start up, I get a warning that the drive cannot be read by my computer. I can ignore the warning eject the drive or initialize it. The latter would erase all the files I have on it. It won’t mount and I don’t know what’s wrong. Can you advise?

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Hi @Donnasummer
Have you opened a Support Case? If not opened, for more information, please contact the SD Technical Support team for best assistance and troubleshooting: