I have had a mightmouse for 2 years now with no problems. Recently I have been getting a window that pops up saying "bluetooth not available" - and this is after I have been using my mouse successfully for a while (hour, 4 hours, 3 days). The bluetooth icon in the top right of the menu bar has a jagged "lightning bolt" looking thing through it. Is this a problem with my mouse, my computer, or just me being dumb. THANKS!