iOS 11 Update

Posted:
in iPhone
Hi guys. I updated my iPhone5s to iOS 11 just recently. 
after having updates I had troubles with my phone.
My phone will turn off even if it shows 40% (which never happened prior to the update ) 
there are times that It will have dead spots on my screen ( I need to restart to make it work again )
I want to go back to the old version 
Is that even possible?
I appreciate your help.
Thanks in advance 
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