Update: While I haven't seen the issue with the 3G/4G again, I still see the wifi cutting out when the screen is off. I notice it because many times when turning the screen on after getting home and connecting to the wifi, the phone will be on 3G. Within a few, the wifi kicks in, but there shouldn't be this issue, at least there never used to be.
BTW. loving ICS! Love the new look and the way they seemed to listen to many users in some ways. Is there a way to remove the clock from the notbar? Probably not. Still discovering teh new bells and whistles.