Micro-sd Disconected when Transfer files to computer via connector

I have the SanDisk Ultra Extreme Micro SD 64GB SDHC/SDXC Card CLASS 10 UHS-I (Not anymore at sandisk card section) and i use it in my Galaxy S4 i9500 phone to save pictures on it.

I have windows 8.1 x64.

Now, i insert the micro sd into Sandisk ImageMate All-in-one and connect it to my computer.

I start transfering files from it and suddenly the device disconnected! Even when i try to just see the properties it gets disconnected.

I must say it was allways working for me without any problems.

Can you guys tell me why it is happening or how to fix that?

Also, is this a knowing bug at that specific product?

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