It shouldn't be freezing after a factory reset and nothing else going on.. Have you installed any apps? Is GPS turned on? Have you set up WiFi or an email address?
It sounds like it might be a faulty touchscreen, as mine's never locked up like that (had it about 3 weeks now). Mine does get a bit slow waking up, sometimes, but the screen starts responding after a couple of seconds. I think it might be JuiceDefender reactivating 3G, and all the programs waking up and trying to send and receive their data.