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To answer your inquiry we don't have any reports of issues with this particular mouse(Razer Imperator 2012).
Here are our recommendations:
1. Make sure to have the latest drivers or updates for the device.
2. Test with a different one in order to narrow the issue properly.
You solved your problem but if anyone will have similar issue in the future this is probably the cause:
If you turn on "Fast Boot" USB optimization the mouse will not work in bios. I noticed this today when i enabled all 3 fast boot options and then i went back into bios but mouse did not work. Then i remembered that USB optimization was on. Had to reset bios to be able to use mouse again.
I am having the same issue with my mouse while working in the bios it randomly moves around the screen and trying to click on anything is almost impossible. i am running a microsoft mouse and keyboard, keyboard works fine but the mouse clicks on stuff all by itself. i have not fast booted anything as well it cant be done using the mouse lol. will try a wired one when i get home