On rare occasions, the device may have trouble connecting to Wi-Fi. Many users have expressed frustration that their Kindle Paperwhite won’t connect to the Wi-Fi.....
https://techplanet.today/post/how-to-solve-kindle-wont-connect-to-wi-fi-issue

Have you ever had the issue where your Kindle Paperwhite was working just fine the day before but all of a sudden today it won’t....
https://kindleassist.org/kindle-paperwhite-wont-turn-on/