I have 2.2 and did a factory reset, which fixed a lot of the problems I had with lagging and all around buggy behaviour.
But I now have this problem with the screen freezing every day, app being used doesn't seem to matter. It does it with Handcent, it does it with home screen panels and I can't go to the next panel.
This freezing is fixed by turning screen off and on and within a few seconds, it blinks and unfreezes.
Has anyone else encountered this? Is it caused by a certain app or is it yet another 2.2 bug?