I am wondering the same thing. I have not experienced my phone powering off, but it seems like I'm not getting my news alerts like I normally do. Everything seems delayed. It does not update my Twitter either. I am wondering if I delete it and just keep my battery level at Maximum battery saver and have my emails fetched at 30 mintues if that will be enough to save on my battery without having Juice Defender installed.
Has anyone noticed if Juice Defender on Droid X goes through frequent cycling? I've had the Droid X for a month and one of the first apps I downloaded. It has been great and doing a good job. Lately though the app seems to have a mind of its own. The phone screen will show the Motarola logo and go through the whole power up process. Then a few minutes later it will do it again. Has anyone run into as similar problem. Wondering if I should delete this app?