Updated to stock touchwiz 4.3, phone freeze when make call
I was using CarbonROM based on JB 4.3.1 but was getting fed up with not being able to connect with families oversea through VOIP such as skype, viber, etc... because the mic doesn't work with voip apps in AOSP Roms. So I decided to go back to stock and full flash samsung's 4.3 stock rom via Odin 3.9; the rom was 2.24GB extracted so I'm almost certain and well aware that it's the bloated tmo samsung tw version.
About device show android version 4.3, baseband M919UVUEMK2, and I can get LTE signal fine but cannot toggle wifi on. And when I go to place a phone call the entire UI freeze and won't respond, then come the "Process com.android.phone isn't responding" dialog box. Except for wifi and phone call everything else seems to work, but I haven't tested extensively yet nor are they important to me.
From here I went about installing latest CWM recovery and SU, and I was able to install OmniROM and CM11 nightlies. But the phone UI freezing problem still persist even with those custom roms.
At this point I have an inkling it has something to do with the new MK2 modem. I noticed that when installing the stock fw it had modem.bin and NON-HLOS.bin entries in Odin. I read through other threads and some mention about not installing NON-HLOS.bin file, but it was included in the stock fw so I don't know why it would misbehave (if it's the culprit)
At this point I am out of options. Someone with knowledge and experience with this please give helps or suggestions. Thank you!