RudyLis: I had similar problems with other mouses, both Razer and not.
One issue involved climate-control unit, don't ask me how, but when that thing was about to turned on or off, many of us had issues with USB devices. Nobody could figure out why - climate-control unit wasn't plugged into same sockets our PCs were, it was connected to different power grid.
Since I doubt that's the culprit in your case, I recommend to check different mouse on your PC, since you already tried your mouse on another PC. This way you'll be able to localize the problem - whether it's mouse, or USB port issue. Or both. In addition, check the way your mouse's cable is placed, there maybe some tension occurring, that causes dislodging of some wires/contacts during movement.
Also, IIRC Razer doesn't have two types of software for it's peripherals, like Logitech does, and uses Synapse for everything. Try to download different versions and install them, to figure out which one will work.
My computer is on a very unusual desk. Its not a traditional wooden desk like this:
http://s7d1.scene7.com/is/image/officedepot/565902_scene7?$Enlarge$
Mine is small, made of metal. The table to place the keyboard and mouse is small, flat like a glass window, and hanging in the air.
Its uncomfertable because now I cannot place my arms on the table because it will bend down. And the mouse cable is dangling in the air. I have to use this computer sitting upright.
wolfsrain: I gather that's the case's USB?! Those tend to die faster than the ones from the mobo.
Well I went to the Razer Nage website itself and they mentioned the exact problem of the Razer Naga 2014 in their FAQs.
http://www.razersupport.com/gaming-mice/razer-naga/
"My mouse cursor is not moving.
Please try cleaning the sensor lens with a Q-tip and some rubbing alcohol and let it dry for 5 minutes and try the mouse again. If it still doesn’t work, contact us here or call 1-888-697-2037."