Surface Book / Windows 10 - Why does my 200GB MicroSD card keep disconnecting

I have moved my Google Cloud and MSFT OneDrive to a 200GB SanDisk MicroSD card and multiple times a day I will get a message that my "D Drive" can't be found or is no longer connected. Moving files to this drive and will get message, "can't reach D Drive" and I hit retry and it reconnects. Why so many disconnects?

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