Support glitchy android

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http://androidforums.com – hey, so my galaxy s3 is about 4 months old now. iy has never suffered any major drops and the only damage is a tiny crack in the corner of my screen but for some reason it seems to be incredibly slow and glitchy. apps crash all the time, or take forever to load and sometimes when they do load they then start to reload the page with no prompts from me. lots of small little problems but very irritating any advice on how to stop this would be much appreciated!! (General)