Att galaxy s3 super glitchy!

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http://forums.androidcentral.com – i recebtly got my new galaxy s3 for att april 18. the first few weeks it was amazingly smooth. but now, it has been very laggy, slow, and absolutey NOT a pleasur to use. i have norton anti virus protection, it says its all fine. a lot of my data in like games and stuff are on my sd card. i have 6 gb. left on the actual PHONE. i have fast reboot and run it a few times a day. i also close out all of my apps frequently. and sometimes, during games or just on my gomescreen my volume doesnt want to go up and down.. only the ringtone. plus, my phobe likes to reeboot itself and get stuck on a homescr (HowTos)