Having an issue with a Sandisk Cruzer 64GB (SDCZ36-064G). Bought it a good few months ago, issues were present immediately. I work on an IT helpdesk so use this stick in a lot of different systems.
What’s happening is the drive is failing to be recognised by Explorer after the second or 3rd use. 1st use in a PC works fine every time, but after that is gets progressively worse. The drive will flash on and off (usually, when idle, it “pulses”) slowly at first, then after a minute or so it starts to flash rapid, explorer won’t see it at all, but it will show up in device manager (invisible to Disk Management too)
Uninstalling the driver via device manager, unplugging device then sticking it back in seems to be the fix (9 times out of 10) and I’ve even tried locating the .sys files that the driver installs with and forcing windows to re-download them (cut them from the “Drivers” folder then reinstall device)
I always use the safely remove option, and have tried formatting the drive previously (formatted to NTFS ATM) and every other drive works in my system fine. This happened in my old Windows 7 ent x86 and new Win 7 ent x64 machine, also happen in Win7 pro and I think I remember it happening in an XP machine too, tried using both front ports and rear ports (in case of a power issue)
Finally, I run linux at home, and with my home machine I have never experienced a single issue with this drive, which leads me to believe the drive itself is fine.