I have also found this using a new Kobo Touch (software 3.0.1).
If I turn off Wi-Fi, it will not reconnect when I turn it back on. I just get the 'Something went wrong' screen.
I have to power the Touch on and off to get Wi-Fi to work again. Then it works.
I have e-mailed Kobo help but, so far, only received a general 'try a factory reset' e-mail. I have followed up to say this didn't work.
My router is a BT Home Hub.
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