my iphone 7 says internet password is incorrect

i’ve had this phone for over a year and have had no problems with it, but about 3 nights ago it kicked me off of the internet. when i went to go back and reconnect it said the wifi password was incorrect. I asked everyone of they reset the password so i just kept entering it and after 7 tries entering the same password it finally let me connect only to disconnect me a few minutes later. I came to these forums and did everything everyone said would help including: restarting phone, restarting router, resetting network settings, forgetting the network, tapping renew lease in the info section, and turnigjn airplain mode on. Adding my own forum is my last resort other than taking it into one of the stores to see if they can fix it.