tried reinstalling mobile substrate...didn't help, also wanted to add i'm using the restart (via sbsettings) if that matters
edit: I just shut it down (by holding in the power button) turned it back on only to have it freeze at the apple logo again.
after force boot it brought me to a stock screen, no cydia tweaks working and I could even launch Cydia, scared me for a bit, restarted again and all my tweaks and everything else is working. (although i'm not sure if I can restart the device without it freezing again)
Weird stuff