Jelly Bean :: Galaxy S4 Losing Data Connection When On 3G

I first noticed this maybe late last week where my phone would appear to have data (bars and the 3g/4g symbol) but not actually being able to connect to things. I'd enable and disable airplane mode to reset things and it would work for awhile.

Yesterday, I contacted Sprint about this because it is fairly annoying. While paying closer attention, I started noticing that my data worked with 4G but would not with 3G. In Settings -> More Networks -> Mobile Networks - > Network Mode: I changed it from LTE/CDMA to CDMA. When the phone rebooted, I was on 3G and the data worked. When I changed it back to LTE/CDMA 4G would work but 3G would not. I've also tried Automatic and 4G works but 3G does not. Needless to say, I spent an hour with customer support and their best solution was to just leave it in CDMA mode. When I complained that I'd lose my 4G service, the tech asked for my zip code and after a moment told me 4G was unavailable in my area. I've been using it for more than 6 months, was using it today, and have seen the sensorly maps showing 4G availability......

It definitely seems like a phone issue over a network issue because the 3G network is clearly working if I can use it when I've disabled LTE. The most annoying/frustrating issue is that the phone claims to have 3G but nothing works.

Phone: Samsung Galaxy S4
Provider: Sprint
Android Version: 4.3