27-01-2013 13:43 - edited 27-01-2013 13:46
This does not happen to my 920 which remains on H or 3G. Do you have Battery Saver enabled by any chance? Goto Settings>Battery saver to check settings,
just want to share my experience to everyone dealing with the issue with my Lumia 920 that keeps disconnecting or losing connection with my cellular carrier. I believe the issue lies with the software if your phone is set to select the carrier automatically. If you set your phone to "Manual" to select network carrier it should resolve the issue. I have been having this issue for about a month now and I just tried fiddling with cellular network settings and decided to select my carrier manually. What do you know, I never have any more problems losing connection with my carrier especially if I enable my data for internet connection. Try it out guys. Hopefully this help at all.