update
After sending my watch + cable for servicing at my local service centre, I received a new cable.
I had this issue once again, charging stop and charge. Happened 2 times on my charge when I got my watch back. start charging from 20% to 100%.
1 week later after draining, I charge my watch and it did happen 1 time on my charge, from 40% to 91%.
I will continue to monitor this.