If I facing such a reboot problems. The easiest way is downgraded to 534, rooted and followed nut on the 4.3 xzrecovery thread. I am sure your problems will disappear.
Send from my C6903 using TapatalkPro
my device: Sony Z1C6903
Samsung I9506
I am using XZ C6603.
It will be a problem if downgrade, it will trigger NFC "upgrade" then cause reboot......
I don't want to wipe /data, I haven't do the latest backup.......