My iPhone 4 has been acting up ever since I jailbroke via jailbreakme.com
Hangs when checking for new mail. Oddly enough when I hold the home button down it always says backgrounder disable, and clears the hang but it just happens again. Anybody know what's going on? Thanks.
Either it's something about using native multitasking vs backgrounder, in which you would need to change some settings.
If not you should try uninstalling backgrounder, if it is fixed reinstall, and if still broken restore.