I've been having problems with my Jawbone UP24 not syncing and sometimes dying completely. This seems to have become an issue with many people as evidenced over in the Jawbone forums. Soft resets worked temporarily but needed to be done as often as twice a day. The problems began when I downloaded the latest firmware update so I decided to do something that seems counterintuitive. I reinstalled the update. I was hoping that Jawbone techs had found the flaw and fixed it. Well, I don't know if they did or not, but my bracelet is working again and has worked without a reset for nearly 24 hours now.

If you're having trouble with syncing or the battery not lasting or with the bracelet dying completely, you might try this and see if it works for you.

I'll come back tomorrow and let you know if it's still working.