On my PC USB2, here ramme incroyablemenent

On USB2 ports, sometimes my PC is recognized, sometimes not, it is a choice or rather randomly.
When she recognized from that we want to copy large volumes here incredibly oar.
(The speed is in KB / s, not in MB / s ...)
Unacceptable for a key 64 GB which suddenly is virtually unusable.
My old PNY 32GB USB2 (which 2 years) is much faster and is reliable.
Personally, I'll keep my PNY get rid of it.

AVOID!