mine
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mine is older than yours 

IMHO, App Lock isn't the biggest culprit. WeChat is.

Its just that App Lock only amplified the battery drain even further.

This is why I only use WeChat on BB/iOS/WP as WeChat on Android just produces too much wakelocks.

WeChat, Viber, Facebook and Google Services

I have either frozen them, uninstalled them or greenified them

that's 4.1.1 issue, 4.1.1 alsow ill cause SDS,.. better update to 4.1.2 ( if u dont want the knox ) or update to 4.3 ML3 official stock ( if u dont mind the knox )

just download the official 4.1.2 stock rom and use Odin to update it,..

Please ask your friend to upgrade to 4.1.2 or 4.3 asap.
4.1.1 will cause SDS.
My gf kena already. Have to change the whole motherboard which costs a bomb.

got a question, can note 2 write chinese with the s pen?

Hi All Sifu, my n2 recently encounter SDS. Upon checking by samsung service centre, confirm need motherboard replacement. Phone is 14months old.

My question is:
1) Rm700 and only 1 month warranty,  worth fixing?
2) Chances of encountering similar issue again?
3) Go for 3rd party phone service, only rm500 3 months warranty.

Many Thanks

Prior to SDS. There is a few signs.

1) I just notice my phone more laggy den usual, i tot its laggy cause more apps and data installed (3 weeks).
2) One day i notice my phone is bit hot. (Heat when you play high graphic game like RR3), I wasnt running any app in background.. end process but still same so i restart den it was fine (1 day).
3) A day before SDS, the phone shut down itself. I plug into power plug and switch on again. Work like charm.
4) SDS day, after work.. while doing gym, i check whatsapp a little in between session and next thing i knew. Its DEAD!
5) Took to Samsung service centre which is a stone throw away. Confirm SDS. Need motherboard replacement.
6) Yes if not mistaken it was on custom rom 4.1.1.
7) Phone is well taken care. No power bank charging and no charging while using. Sometimes i even off phone or switch to airplane mode for charging. No water damage. Dropped 2-3 times with rubber case but low impact (last was 6 months ago)

Bad luck:( Any one else can share their experience?