I got my Nexus last month, and I absolutely love it (except for the battery). I found one weird annoying problem though that's been constant. If I switch it from 3G to 4G, within a minute, I lost all data signal. The bars are grayed out and there's an X over them. It comes back 30 seconds or so after that, but then it will happen almost every 5 minutes on the dot. This doesn't happen at all when the radio is switched to 3G. Very obnoxious!
Is this a hardware issue where I need to replace the handset, or is this a problem with some kernel/software/radio file? Can I flash another radio or something that would fix that? Thanks in advance for the help. I attached a screenshot of what the problem looks like.