Explorer mini mouse freezing up

I own a farily new Mini Mouse wireless mouse. Initially it worked great with
no problems. My problem now is that the mouse intermittantly freezes up. When
this happens, I need to power down and reboot the computer to use the mouse
again. The product seems generally good. The only drivers associated with the
mouse are for configuration, other than that there is no software involved.
The mouse is basically plug and play.

Is this a mouse problem or a PC problem. Any suggestions as to how to solve
this problem would be appreciated.