Iphone 3GS keeps glitching out?

Ok so i got this new iphone 3GS from a friend, it keeps putting it in recovery mode, then leaves recovery mode and wants me to re activate it like the iOS thing and i keep resetting it. The phone seems F*cked and yah… Like it works and looks brand new, but i need to find a way to make it so it stops putting it in recovery mode, turning itself off, saying connect to itunes and all that ***. I don't want to have a glitchy phone someone please say theyve had experience and know what to do about it >

What os r u on r u jailbreaked if so then save blobs now before upgrading try to restore that should help let me know for any info i'll try to help but can't promise.

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