I'm having this exact same issue. I live in a 4G area, but it will occasionally drop into 3G. I can't seem to get data when this happens. If I switch to CDMA only mode, nothing works or has data. So if I switch to CDMA only, reboot, and then wait a few minutes, the 3G icon comes up and I get 3G data, though its very slow (.5-2Mbps download). I don't know what the normal numbers for 3g are, so maybe that's to be expected. If I switch back into LTE, it syncs with 4G within a minute or so, but its obvious that the switchoff between 4G and 3G takes some time and doesn't always work, and there is no data during that handoff period. So if I lose a 4G signal temporarily, its about 2 minutes or more before I can use data again even if I reacquire 4G. And if I don't, there's no guarantee that I'll get 3g.
Also, 4G works great for me most of the time. But another issue I experience is that it typically slows down to around 5- 8mbps d/l and 1-2mbps u/l according to the speedtest app. Browsing, downloading, and watching youtube in HD all seem to be as quick as ever at those times, so it could just be the app, but I'll occasionally get low 20's/high 4-5's like I'm supposed to. Every now and then I'll get a lower download speed than upload (like .7Mbps or something!), and that usually seems to happen around the times when 4G drops out for a bit.
I'm still on ED1, so its not that. The rest of the phone seems to work great, its just that it has occasional network issues, and its often reading a lot slower than it should be. I really would hate to exchange this phone, as I've put so much on it already and it seems to work great otherwise. I honestly don't think there's anything wrong with my device, especially since so many of you had similar problems. Does anyone think an exchange would help? Again, I'd hate to do that if it won't help, seems like alot of trouble.
Ken, can you please link me to the VZW support thread you're referring to? I'd really like to get in touch with a tech who can tell me if this is an issue in my area or with my specific device, thanks!