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I bought a new PC (Lenovo U3170) but it seems that built-in SD card reader is broken, but I looked better, and i determined its not, because I copy pasted 1GB of files and during the transfer it was ok it took like 8 minutes...
But when not in use it keeps "crashing" like 3 in 3 minutes...
So, what is the problem with the SD card reader?
Edit
When not crashing if I try to open it in file explorer the pc play the "disconect" and "connect" sound (like when you Plug in a device) and it crashes too...