Since I installed 10.5.1 I have this weird problem... When I'm running my 12''PB on batteries and percentage falls to 20%, after a minute or two computers just suddenly falls asleep. Then when I plug in the power cord it seems like the battery was empty and starts recharging from zero. I know battery is not a problem cause just couple of days ago (with 10.5.0) it worked perfectly well (aprox 2.5hours). In 10.4 though it lasted over 3 hours! Anyone with similar problem?