Ipod 2g on 4.1 keeps crashing

[JetLife]

When I install some apps on Cydia, it cause's my whole iPod to crash and the iPod reboots itself. I press install and it begins to install, but within 5 seconds my iPod crashes. Is there any way I can fix this? I am downloading from the 4 or 5 standard sources that come with Cydia. I am running greenpoison jb. I have tried restarting my iPod before I install, and I have tried respringing