Random reboots on rooted Android

[fnm442]

I'm using a rooted ZTE Force with stock rom running android 4.0.4. Recently, my phone started randomly freezing where, after a few minutes of being frozen, it will show the boot splash screen (without showing the android symbol beforehand or checking the sdcard afterwards like a normal reboot) I usually have to reboot the phone for real afterwards because it will run incredibly slow if I dont. I've tried uninstalling apps I dont use, power cycling, etc and nothing has worked. Help?

Edit: I had Clockwork mod installed on my old sdcard and it died. Am now using a different sdcard. Could that be causing it?