After a power outage, the same thing is happening to me.
Every (many) device in my home must be reconnected when I change the wifi password or SSID.
Resetting the network on the Roku didn't fix it.
By doing a factory reset, I have to relink the TV to my Roku account, which will break my home automation system (Amazon Alexa, Hubitat, etc.).
You're joking, Roku. WIFI isn't available in 2022, is it? That's amazing.