Network drops on sleep

Since upgrading to Lion 10.7.2, whenever the computer goes to sleep it loses all network connectivity. This is either wifi or ethernet. It will reconnect after a minute or so after waking, but it is incredibly annoying as ichat has disconnected, I get no email and no calendar updates push.

I have also noticed that the USB ports are no longer active.

I have read many of the posts and none apply directly to my situation as my network never goes out while the unit is awake.

I have deleted all of the suggested prefs. I have reset the SMC, I have tried ethernet only, and wifi only. I am using an AEBS with dual band that is as updated as it can be. I am on channel 11 for "g" and 149 for N. there are no other networks near with those channels. I have deleted all keychains relating to the network. iphones and other computers in the house not experiencing the same issues.

I did not have this problem in SL.

Any new suggestions would be welcome.

Thanks,

Debbie