I have updated to 4.4.2, but recently i notice my Note 2 will sudden very lag or hang until i need to take off my battery to restart, before i update it is very good.

Any ppl face this problem after update?

Izzit in settings --> account --> backup and reset?? then when i press it, the back up my data was tick same for the automatic restore

Then just click data reset???

the backup izzit will save my contact, sms, photos? what about whatsapp history?

how? i am noob here...