http://forums.androidcentral.com – Just got a Nexus 4. I was testing the push function for gmail and started seeing anomalies. Searches revealed these two threads Issue 42272 - android - Nexus 4 stops responding to ARP requests when screen is off with wifi on - Android - An Open Handset Alliance Project - Google Project Hosting Google Groups Obviously there's an issue. For me, the Gmail app is almost totally useless. (HowTos)