Might be some of the Pwnage patches are causing side effects on the 2.0 firmware.
I used stock fw 2.0 and everything was running smooth.

Then I wanted to jailbreak and install Cydia, and since I pwned, it's very unstable.
Today I received a call, but I could do hang up, the screen was frozen...

Hope pwnage tool is not the reason of those issues and that those are bugs that will be fixed by Apple in firmware 2.0.1...