Re: 4g not connecting anymore!
Sorry for the late reply. It could possibly be a setting on your phone. I say make a backup of your rom, flash a stock based rom, kernel & firmware, if it's not ma6 find an update or one based on it. Update the prl and profile. See if you can get 4g working on tw, if not then either restore back to cm10 or try messing with the lte settings, their are some that allow you to enable or disable and such. I also do recall a setting for ehpd 4g or lte 4G. After messing with them try restoring back to cm10. If you take a picture of the lte menu I can look and tell you what settings I clicked.
Edit: Just looked at the link try the lte force cause I know I pushed that button as well as a few others.
Sent from my SPH-L710
Phone: SPH-L720 16GB (Black Sprint SGS4)
Recovery: TWRP 126.96.36.199 touch recovery
ROM: CarbonROM KK Nightly 08-03-2014
Kernel: ChronicKernel KK 4.4 AOSP JFLTE v3.4
GAPPS: PA GAPPS 4.4.4 07-29-2014
MicroSD: Samsung 32GB