Just to be clear, has this always been a problem or is it just now appearing?
The reason I ask is some people push on the slider when plugging the drive in and that is not necessary. Once the plug is out holding the outside of the case is all that is needed to plug it in.
If this is a problem just now appearing then I suggest returning it to Sandisk for a replacement. Be sure to backup all your Cruzer files to your hard drive before sending it back.
For sure a mechanical issue. Not else that you can do here but to request for an RMA. Hopefully you’ll get a replacement instead of it just being fixed.