I am hopeful someone will have an answer. If I had it to do over again, I would have stayed with ICS. Never ONE problem with ICS and now with JB everything is in question. I did a total factory reset, took the battery out for 40 minutes before I replaced it, drained the battery to 15% and then charged fully. Re-installed my apps and other files. My phone still is not working correctly. Apps seem to work briefly after a reboot but then working again -- apps like file managers, video players etc.; not all apps --- email is working, internet is working etc. Not sure if battery life has gotten better or not but it really does not matter if I can't depend on my apps to work. I read about doing a clear cache procedure but could not get it to do what the poster was suggesting. Any thoughts from anyone else out there? I wish I could go back to ICS.