iPhone 7 wont restore

my problem started yesterday when I opened snapchat and tried too record a snap, while recording my phone restarted, I didnt mind it, I opened snapchat again and the same thing happened, now everytime I opened my camera it restarted. after some time my phone started restarting again and again whether I open camera or not, so I went online and tried a couple of solutions but nothing helped now this last solution was to restore it via itunes so I hooked it up with itunes and downloaded my software put it in recovery mode now everything was going alright and all of the sudden when itunes showed preparing iphone my iphone restarted and disconnected and itunes gave the error that THIS IPHONE ‘IPHONE’ CANNOT BE RESTORED. now everytime I turn on my iphone it shows apple logo and then the screen goes black asking me to connect to itunes and everytime I connect it with Itunes it restarts and disconnects, please help me and give me an appropriate solution for this