Wi-Fi Keeps Resetting

Hello

What causes Wi-Fi settings to reset itself? Or has there been any known issues with a recent iOS update?

My iPhone and iPad, both running the latest iOS, are connected to my saved home Wi-Fi but throughout the day it would lose the Wi-Fi setting. Both devices will pop-up a message asking me to enter the Wi-Fi when it should be connecting automatically.

I don't think it's a signal strength issue as all my non-iOS devices don't disconnect plus even if it was a weak signal/disconnection issue presumably it shouldn't keep asking me for the password each time it's trying to re-connect again? I have toggled the setting to automatically connect to my home Wi-Fi network.

Any advice would be much appreciated.