1.I think some problem in my usb port(all the port).
2.pen drives works perfectly but when i transfer data using card reader(any brand), while copying a file it disconnects automatically.
3.My usb hub and bluetooth device(malfunctioned) are not working.
4.I thought my usb port makes it malfunctioned.
5.And i also lost my usb audio device.
6.All of my usb devices are working for only 2-3 months.