I've been having the same problem, since the 10.5.7 upgrade - my bluetooth mighty mouse stops working 2-3 times a day. Weird thing is my bluetooth apple keyboard works fine during such mouse dropouts.
I still haven't figured out if any events cause the mouse to stop working, or if it's plain random. The only way to bring the mouse to work again is by turning my MBP's bluetooth off/on. Batteries are fine btw... has anyone figured this one out?
Just got off the phone with them (their new "create a case online and have AppleCare call you" thing is kinda cool!)^ What did AppleCare say?
I've lost them 3 times today which is a record for me.
At least not here: uMBP 14" with Mac OS X 10.5.7 and the Bluetooth fix installed: Lost connection to Apple BT keyboard and Mighty Mouse two times since yesterday.Let's hope it works.
Apple is said to have... addressed a problem where Bluetooth devices would inexplicably fail to function without notice.
Awesome find.