Random times for me too
It happens at random times for me too. Mine is also a brand new 24 iMac and wireless mighty mouse.
I'm having the same problem but it's not when i come out of standby. It's at random times while in the middle of using the mouse.
BTW, it's a new 24" iMac and wireless Mighty Mouse.
It happens at random times for me too. Mine is also a brand new 24 iMac and wireless mighty mouse.