Samsung Kies huh... Last time I update my phone to KL3, the phone entered Download Mode but Kies aborted it because of some "buggy" connection error.
Luckily it doesn't brick my phone.
The update was successful at the second attempt.

I have 25% of *ahem* apps and 2 black market. No camera hangs at all.

I think my phone gets the symptoms from ahem apps as stated at the first page.
Sudden reboots occasionally and hangs while browsing.
What should I do now? Factory reset?

I uninstalled some pirated apps.
Now left 5 pirated games and 2 dictionary.
Will report back after some days.

Darn... I'm bored of keep restarting the phone for more than 2 times per week because phone will become lag or hangs after some continuous up time of phone. Hope this is just pirated apps issue...