help me please

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http://forums.androidcentral.com – Hi Dear all im rania and I have a problem with my galaxy SIII After the last updated to the phone I noticed that my device start to closing to the home screen automatically without my permission and sometimes its shut down and restart with itself I tried to scan it searching for malworms or trethds or viruses but nothing I tried to delete some apps and nothing happened I downloaded multi kind s of anti virus but I uninstall it all right now and I kept just NQ mobaile security and dr anti treths So help me please (HowTos)