I have an Apple Watch 7 that came with the USB-C charging cable. I always left my AW near my bead in Nightstand Mode at night. Occasionally the watch wouldn’t charge overnight. I first thought it was either the USB-C charging puck or the USB-C charger that came with my iPad mini 6 so I switched back to the regular USB charger and pucks. But it still happens every once in a while. And yes I have done hard resets on the Watch and unpaired and repaired it also. If it was happening every night or even the majority of them I would make an appointment at the Apple Store. Any other suggestions?