Not to bump an old thread, but my series 4 44mm does the same thing as OP. Here's what I noticed:
- When connected to the puck, my watch will charge for a few minutes, then stop.
- Sometimes it reconnects, other times it does not.
- Takes a couple hours of me hovering over the watch to make sure it reconnects with the charger for the s4 to charge properly.
- Most interestingly, it seems to charge better when in Airplane mode.
- Also interesting, when connected to the wall plug, it doesn't charge nearly as well when using a power bank. The power bank provides a more consistent flow.
- Keep in mind this is WatchOS 6.1.1
- I've also done hard resets, and wiped the s4 and set it up as new. When it was set up as new, it seemed to charge better, but still very inconsistent.
- The charging puck seems to work perfectly with my brother's S2 as well.
- I've recently removed 3rd party apps and will see how that affects the charging.
Hopefully there is a solution?