My computers cannot recognize my USB stick Safari.

Hallo Guys!
I have this new USB stick Safari which I have used for barely a month now. It had been working fine till yesterday when it refused to open in any of my computers. When I plug it in, I get the notification that the USB is not recognized. When I go to the device manager and try to update the drivers, I get the message that the drivers installed are already installed. What could be the problem with my USB stick? Thanks.
