Watch is heating so quickly and so hot, what should we do?
When I'm charging the watch it's getting hot.
Apple Watch Series 1, watchOS 6
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Sounds like it may be a hardware problem. For service & repair:
watch Repair - Official Apple Support
watch Service Pricing - Apple Support
Although this may not help, you can try the steps in:
If your Apple Watch won't charge or it won't turn on - Apple Support
If you still need help, contact Apple Support.