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!