Hello Ivaylo8881,
Thank you for reaching out in Apple Support Communities. For an Apple Watch that is unresponsive, we recommend to perform a force restart. This is a step that can help for an Apple Watch that is not responding. Here's how to properly force restart an Apple Watch:
Force restart your Apple Watch
You should force restart your Apple Watch as a last resort and only if it's not responding.
Don’t force restart your Apple Watch if you're updating watchOS. After you see the Apple logo and progress wheel, leave your watch alone and on its charger until the update finishes.
To force restart your Apple Watch, press and hold both the side button and Digital Crown for at least 10 seconds, then release both buttons when you see the Apple logo.
We look forward to hearing back from you with an update.
Kind regards.