My Motorola H500 headset worked at first, but not anymore. I CAN pair it, and the assistant says it's connected but half the time it still shows as not connected in System Preferences. And then, sometimes when it IS connected and working (rare), System Prefs still says it's not connected. And usually System Preferences simply beachballs when I try to go to Sound Prefs. A restart fixes that... until I pair the headset again. (It seems to help if I turn the headset OFF before going to Sound Prefs, and then choosing the heaset--which shouldn't even be listed then but is--and then turning it back on.) Is there some file I should chuck to get a fresh start? I've tried deleting the device from the BT list and re-adding it, but that doesn't help. It's a bit of a mess all around. (But hey, half price at Amazon!) Or should I suspect a defective headset? Even when it worked it was hit or miss--but I chalked that up to Bluetooth being Bluetooth. TIA!