Hello,
I don't know if you ever got your problem solved, but following are some potential problems which might cause this issue. I figured that it might be helpful to post these potential problems in order to help you and others.
Laptop/notebook computers:
-- The new Seagate Backup Plus drives internally use standard SATA drives which have relatively low power consumption. But if you plug the drive into a USB port while an adjacent USB port on your laptop/notebook also has a device plugged in, the drive may periodically disconnect. Why? Because both of the adjacent USB ports might actually share the same power source. If your laptop or notebook computer has other USB port(s) located elsewhere on the the computer, try plugging the Backup Plus drive into one of those USB ports instead since those other USB port(s) should have their own separate power supply.
-- If the paragraph above doesn't work, even after making sure that the only USB device attached is the Backup Plus, then the USB cable supplied with the Backup Plus drive might possibly be defective. Or there might simply be a tiny bit of oxidation on the SATA connectors of the USB3 adapter or on the SATA interface of the internal drive itself. The solution for this: Unplug the drive from your computer. Then unplug the USB3 adapter module from the end of the drive case and then plug it back in again. Then plug in the USB3 cable to the drive's USB3 adapter module and plug the other end of the cable back into your computer.
-- If the paragraph above doesn't work, try connecting the Backup Plus drive to another computer and see what happens. If the drive doesn't mount properly or frequently disconnects, then the drive's USB3 cable or USB3 adapter should be suspected of being defective, or possibly the drive itself.
Desktop computers:
-- Testing is similar to the above for laptop/notebook computers, but with one caveat: Test by using one of the USB ports on the back side of the desktop computer since those USB ports are built into the computer's motherboard. The frontside USB ports on desktop computers are invariably connected to the motherboard via cables. Thus the cable itself within the desktop computer's case could be defective or possibly not even USB2 compliant, or there could be oxidation in the cable's connector to the computer motherboard. Once again, quickly rule out or determine issues with either the specific computer or Backup Plus components by simply testing the drive using another computer.
I hope this helps!
