There are a few reasons why your device might be activating Voice Control. One possibility is that you have accidentally enabled the feature. To check, go to Settings > General > Accessibility and make sure that Voice Control is turned off. If Voice Control is already off, another possibility is that your device is mistakenly interpreting certain sounds as commands. If this is the case, you can try disabling Siri's "Hey Siri" feature or adjusting your device's settings to better recognize your voice.