iPad randomly restarting and WiFi grayed out

Hello, my problem is my iPad will randomly reboot, when it comes back on the WiFi will be grayed out and I am unable to turn it back on. Only after several restarts does it work properly....for a little while. I have already replaced the WiFi antennas and factory restarted it so that can’t be the problem. The problem started when I tried to use my aunts charger on my iPad, a charger that I didn’t know was a fast charger, my theory was that it overloaded the iPad with power. Don’t know if that’s the case but what ever it is, how can I fix this?? Thank you in advance for any help you can provide.