Welcome the Technical Support section. Help us in assisting you by providing us with a concise and descriptive elaboration of your issues. Be specific and if possible, provide us with a step-by-step instruction in replicating your problem.
I have installed rockettheme - paradigm and then installed jomsocial com_community_std_3.1.0. I also installed joomlaxi - XIPT-4.0.5_Stable_Joomla2.5-3.2_JomSocial3.1.
I have found that after a few hours, I lose the ability to login to my administration access.
I have even tried creating 3 different SU accounts and all lose access.
I have access through the frontend user login, but it fails on the admin login.
To be honest we're really not sure what may causse this problem, since it didn't happen for anyone from support team, and there's no certain way to replicate this issue. Raymond, please ask your hosting provider to revert your site to some back-up before this problem starts to occur.