Why does the watch occasionally show a red exclamation mark? What is going wrong with the watch?
Is this a major malfunction ?
Apple Watch
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If your Apple Watch displays 
after a software update, try these steps:
- Press and hold both the side button and Digital Crown for at least 10 seconds.
- When you see the Apple logo, release both buttons.
- If you still need help, contact Apple Support to set up a mail-in repair.