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WiFi stop at charge 50%
Hi @Mn9, welcome to our forum!
I'm sorry to hear about this. 
Do I understand correctly that when you charge the phone and it reaches 50%, Wi-Fi is turned off? If that is correct, can you go back to Settings > Wi-Fi and enable it or if you drag down the quick settings in your phone and enable it that way or can you not enable it at all?
I would recommend that you try rebooting your phone in safe mode and check if Wi-Fi turns itself off at 50% when you are charging the phone when third party applications aren't loaded.
Let me know if that helps!