Here are three ways to stop Siri from randomly activating on your Apple Watch:-
1. Disable "Listen for Hey Siri":- This is the most common culprit for accidental Siri activation. Here's how to turn it off:-
-Open the Settings app on your Apple Watch.
-Tap on Siri.
-Toggle off the switch next to "Listen for Hey Siri".
2. Disable "Raise to Speak":- This feature activates Siri when you raise your wrist and speak. If you find it triggers Siri unintentionally, you can turn it off:-
-Open the Settings app on your Apple Watch.
-Tap on Siri.
-Toggle off the switch next to "Raise to Speak".
3. Disable "Press Digital Crown":- This option launches Siri with a long press of the Digital Crown on your Apple Watch. If you accidentally press it often, consider disabling it:-
-Open the Settings app on your Apple Watch.
-Tap on Siri.
-Toggle off the switch next to "Press Digital Crown".
Alternative:- You can also completely turn off Siri on your Apple Watch:-
-Open the Settings app on your Apple Watch.
-Tap on Siri.
-Scroll down and tap "Turn Off Siri".
More details assistance below.
https://www.youtube.com/watch?v=4V7bgWrlf6c&ab_channel=TheGeekPage