Just received the newest OTA update from Google this afternoon, IMM76I. For those wondering, my Nexus was purchased from Rogers Wireless and I’m in Canada. Check out my guide for installing the 4.0.4 update so you can get future updates from Google. U
The update seems to have fixed the sleep/signal loss issue as well as the lag from the unlock while having your brightness settings on auto. I will update if I find more.