Support i have a sph-m820 with an interesting problem

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http://androidforums.com – I have a Samsung Galaxy Prevail model sph-m820 that I got used from a store (no returns on used phones). About an half hour after I got it and my phone number was pluged into it. The phone started acting funky. It took for an ever and a wed to turn on, almost 3 minutes to change screens. Example let's say I click on the calendar from the main menu. The phone goes so slow in changing screens a snail can beat it. I just took the battery out of it because that was still good and throwed the phone in my junk parts box and got a lg-102 phone. I needed a working phone and that's all I could (General)