This is happening on my Defy not sure if it is device specific. I decided to see how long i could make my battery last under my normal usage. After 27 hours i was at 10% and i thought maybe i will check what has been using the most battery. I went to settings, system, battery settings. Chose Battery use option and i get a force close...now i know it was working earlier in that day. I charge up and still not working so i reboot and it works again. On a side not the Coin Dozer game is top of the battery usage list with 18%...makes me wonder how long it would last without me playing that game!