WiFi Connection Issue

(I'm so sorry if the flair doesn't match, I never use Reddit.)

Hi! I've been encountering this issue recently where my Wii U just won't connect to my WiFi for little to no reason. (error code 103-1000 to be more specific). This is the first time this issue has happened, and it's also been happening to my 3DS.

Luckily, I'm able to use my phone's hot spot for my 3DS, most of the games I play on there are offline anyway, but I can't say the same for my Wii U. (It'll connect to the hot spot, and then disconnect a second later.)

This has never happened to me at all before with both devices, and it's only my Wii U and 3DS. My WiFi was completely fine before, and this issue just started a day or two ago. I've deleted any unnecessary connections, did multiple connection tests, set up my WiFi again and nothing has worked.

Please let me know if you've experienced this issue, and what you've done to solve it. I just want to play Splatoon.. :(. Pls and thx!