My new Magic Mouse is frequently losing the connection with my new iMac. The battery is at 97%. It loses and regains the connection within a 1/2 minute or so. This is a refurbed iMac. Could there be a problem with the bluetooth? Any suggestions how I can troubleshoot this to pinpoint the problem, or fix it? I am not using a mouse pad - just on a plain wooden desk. I doubt that's a problem as it has worked and tracked quite well for the three days I have had it, until today.