[RESOLVED]What i found terrible in Codeigniter some times??

[eluser]Zeeshan Rasool[/eluser]
Hi, im working from almost 2 years in Codeigniter and its really very amazing framework. But i have faced a problem very time that CI session has might some issues. Session are suddenly stop their work and your whole work goes down. If i use SESSION[] default PHP syntax, then its work fine. Also redirection using CI method redirect() stopped and i have to use Javascript redirection inmy controller. I dont know whats wrong with this i have same code working fine on my localhost. if you have any solution then very appreciated on sharing
Thanks a lot !

Regards,
Zeeshan