I'm experiencing this too. First my Kobo Aura first edition was suffering it from time to time, and as since lock down wasn't using it much, I don't know when it exactly began to work properly again, but now my Kobo Forma is being experiencing it consistently for 3 weeks or a month, so I finally had to turn Wifi off, because the battery was drained over night and I had to do a quick charge before breakfast to avoid a sudden shutdown while reading during breakfast (I fall asleep while reading in bed, so I'm usually unable to leave it charging while I sleep).
It's annoying, but not so much as to open a ticket with Kobo and returning it to factory state and then side loading again all my books, so I'll leave it to others that ticket.
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