For the last few months I've had a really irritating problem with my USB-C sticks (Kingston mico duo 3c). Between me and my family, we have about 6 of them which all used to work fine on all our macbooks (there are 4 of us with macbooks). When I plug the stick in, it doesn't show on the desktop. It doesn't show in disk utility. BUT, when I pull it out, the macbook makes the sound to indicate something has been removed (the same sound it makes when you plug the charger in). When the macbook is in this state, none of the sticks work. A restart fixes it every time- I was hoping the 10.11.5 update would fix things but it hasn't. So at the moment, if I want to transfer anything to USB, I have to restart my laptop which is very annoying I've done PRAM and SMC resets but to no avail. Has any one else had this issue? Or resolved?