Apple series 7 is charging sporadically on charger
Why is my Apple watch series 7 charging sporadically on charger?
Question marked as
We can't guess, it depends what you mean by sporadically. If you mean intermittent charging (starts and stops at random intervals) I think the most likely cause would be a damaged charging cable or power adaptor.
If your Apple Watch won't charge or it won't turn on - Apple Support