Since I updated to 4.3, I also have issues getting my phone to roam. The only solution is to reboot and wait. Kills my battery doing all that dang scanning.
Luckily, the Roam Control guys have found a workaround for our Note 2's finally so I think I'm gonna finally root 4.3, say goodbye to Knox, and install it again. People seem to be getting it working using S4 settings.
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Stock MK4, Android 4.3 (w/ Knox) on my Samsung Galaxy Note II