I have been using 4.0 for a couple of days (jailbroke with jailbreakme) and just now, every time I open Cydia, it hangs at some point. Sometimes it is at Loading Data and freezes, other times it is at downloading packages and freezes and even once I noticed it said cached failure at the top before freezing. When it freezes, I can either leave it for about 2 minutes, in which the ipod just reboots on its own, or I have to do a hard reboot. How can I fix this problem??