Well I was at work and no issues got home and I got a text when I tried to reply it would not send.. I could only receive . So my 1st thought was towers since I had issues with tower close to my house several times.. after asking sprint said network was good my gf. Gs3 had no issues either .. so then tried prl and profile updates that would make my text work but my data would drop.. after a restart text would fail but data worked.. after talking to sprint and google.. ( they blamed it on rooted since they can see what apps u buy) titanium... but after going back to NAB all issues gone.. I am currently back on NC5 did a full un root version and will see. Guessing it's a NC5 issue or hardware
Ok, sounds like software, here is what I would do. Go to micmars here is the link
http://forum.xda-developers.com/showthread.php?t=2712205 and get his NC5. Now back up all your data i.e. pics, music, etc. to a ext sd card or PC desktop. Go ahead to do a factory reset. Next with odin on your PC flash a fresh copy of NC5. Now this is the IMPORTANT PART check your download mode screen should look like this :
Both lines at official status, sometimes you end up custom and official, so if not boot into your stock recovery, and use the device keys and do a factory reset again. Then odin flash a fresh copy of NC5 again. I know it seems like a lot of B.S. but I call it taking out the trash, you need to get back to stock square one. Boot it up see if the issues are gone, if so odin flash a recovery here is the link for Philz CWM 6.12.9 hltespr its bulletproof
https://goo.im/devs/philz_touch/CWM_Advanced_Edition/hltespr/ then root your device here is the link for SupSu v 1.94
http://download.chainfire.eu/396/SuperSU/ Now if everything is working with no issues, make a backup so you can always restore back to a working OS. Let me know how it goes ?