There're chances of intermittent during charging since inductive wireless charging is very sensitive to ambient conditions and positions. Normally module over-temperature protection (normal protection measures for Apple products) - It can be recovered automatically;

And the causes could be various,but in most of the conditions, we suggest you try the steps below:

1. Make sure the charging system of your Apple watch is normal and the Apple Watch IOS has been updated to the latest version. The Apple Watch may keep trying to authenticating when the IOS is under the old version, which causes the wireless charging intermittence.

   

2. Try to check the apple watch ledge. Make sure a proper ledge was installed to fit the different sizes of apple watch. An incorrect ledge may rise up or down the watch, and causes the mispositioning of the charging spot, which causes a charging intermittence.
3. Make sure there is no foreign object in the wireless charging area on the back of the watch (Exclude FOD effects)and the watch is placed correctly ,you can adjust the watch on the ledge to the accurate place(Usually it will auto adsorb).
4. Try to adjust the position of the strap so that the Apple watch can fit the charging area or remove the watch strap to confirm whether the charging is normal, to exclude the reason of the improper strap placement.( Because when the strap is placed incorrectly, the watch will not be attached to the charging area of the body when charging.)