Mine also and rapidly hang or auto restart in stock especially using chrome and with HD widget on.
Now running CM10.1 without chrome and no HD widget, everything seems much better, the hang seems not happen anymore and restart was rarely happen. For the moment, I think this was the temporary solution.
Phone: Samsung Galaxy Note 3 | | Kernel: Stock | ROM: X-Note 12.0 v4.4.2 KitKat - XXUENB7
Future Phone: Sony Xperia Z2
Ex. Phone: Nokia 3310, Samsung S500, Nokia 7610, 7270, 7280, SE K750, Nokia N73, LG Viewty KU990, Samsung Pixon, UltraTOUCH, OMNIA II, Nokia 3120 Classic, Google Nexus One, Samsung Galaxy S II, S III, Sony Xperia Z, Z Ultra
Tablet: Sony Xperia Tablet Z | ROM: v4.3 - 10.4.B.0.577
Future Tablet: Still Finding
Ex. Tablet: Google Nexus 10