Monitoring Service Ghost

hi, i have instaled Openfire 3.8.2, Monitoring Service pluging works for a few days, then dont show any more the options and dissapear from console, in plugins list are installed and listed, i try reinstall but not activate agains te options in web console, so i have to make a backup off all user, reinstal all openfire server to “activate” for a few days the Monitoring Service plugins…¿someone pass for this situations, why dissapear the option of the plugins and remaint “installed”, its just a trial version of the plugins?..sorry my english and thanks.