Since the new Quickpwn arrived for 2.2, I have had this problem twice, both of which have resulted in a restore.
I jailbreak my Iphone 3G as normal, everything works perfect, I installed a few apps, all works great.
One app I came across, I wasnt keen on, so decided to delete, I deleted the app as normal. Soon after I deleted it, my phone froze, and wouldnt move (froze on main screen) it then unfroze for a few seconds to freeze again, has rebooted its self numerous times, and sometimes stays on standby so I have to hard reset it

.
Also freezes on the unlock slide screen, and it seems as if its freezing/lagging as the the writing on the slide bar seems laggy.
I literally cannot do anything with my phone, which forces me to restore...
What could be causing this problem?