Default [Q] WiFi and Lock Screen - 4.2.2

Heyy guys. I am facing a lil problem at the moment.

After upgrading to 4.2.2 (Downloaded the Malaysia firmware from Sammobile and flashed it with Odin),
  • My 'remembered' WiFi has been cleared and it has been my fourth time.
  • My lock screen seems to have a 1-second lag as well. Sometimes, the lock screen is a little messed up - after a longer call (say 2 mins +), it shows my lock screen but couldn't unlock it.

Could it possibly be my CSC and such?
Any idea how to solve this issue?

Attached are my phone details.
Thanks!
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