Last week, I ended up with the AT&T LTE variant of the Galaxy S III (SGH-i747). What I typically do with a non-vanilla Android phone is flash a third party ROM immediately. My usual choice of CM9 and CM10 were available. I flashed CM10 which was/is a very early preview build with quite a few show-stopping bugs.

I can live with unstable wifi, broken bluetooth, and a laundry list of other things for a while. However, there is one problem that may force me back to the trusty Galaxy S II for a bit...

Is anyone else's SGS3 losing sync with Google when the phone screen is locked and on cellular (not wifi)? I'm interested in hearing from stock TouchWiz users in addition to anyone using a custom ROM. It's like no notifications get delivered until I turn the screen on. Then they all come in at once.

I'm trying to determine if it's a modem firmware issue or just something wrong with the early ROM.