Razer Mamba Wireless RMB doesn't register as being held down

Received my Mamba as a Christmas gift last year and when I press and hold down the right mouse button during FPS games the game seems to register it for a brief second and then goes back into unscoped view or keeps popping in and out of scoped view. I've reset the mouse, tried it plugged in, reinstalled Synapse and tried it without Synapse running, and also moved the bluetooth receiver in case there was a signal issue. However, the issue remains. Is there something else I can try?