My iphone 4s keeps restarting? - 2

My iphone 4s has been restarting every 1-2 minutes and won't hold charge very well, it will be on 100 then 2 minutes later it will be on 65. Ill be doing something on it like snapchat and it will freeze (the screen goes darker and all weird looking) then it will go black then the apple sign with come up and then it will go to the lockscreen. This happens all the time, when i'm charging it it will just constantly do this.

As a first step I would be doing a master reset and reloading OS

be sure to sync your phone on computer first, save all your pics, make sure you have all Wi-Fi passwords and whatnot

reset all will delete everything

settings - general - reset - reset all settings

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