My iphone is connecting to wifi but then disconnecting from it and not allowing me to do anything

i have an iphone 4s version 8.1.2 when i used the iphone it worked perfectly then i go to use it later that day i have connected to my wifi and then my iphone disconnectes and doesnt work anymore on any apps as it tells me to sign into apple id and wen i try it doesnt let me and only allows me to accsess music text messages and nothing else so i decide to restore my iphone and it is not connecting to anything no wifi. o personal hotspot and ive rebooted it more times then i can remember what do i do????

Hi blaze469,
Thanks for using Apple Support Communities. Based on what you stated, it sounds like the iPhone is getting disconnected. I would recommend that you read this article, it may be able to help the issue.
iOS: Troubleshooting Wi-Fi networks and connections - Apple Support
Wi-Fi disconnects or signal strength is less than expected
Move closer to the Wi-Fi router (access point).
Check for sources of potential interference.
Remove any case, stand, or other accessories from your iOS device and see if signal strength improves.
Reset network settings by tapping Settings > General > Reset > Reset Network Settings. 
Cheers,
Mario

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