If all Google services such as YouTube, Gmail, Google Drive, and Google Search sign you out every time you close Opera GX, while other websites like Netflix remain signed in, the issue is likely related to how Opera GX is handling Google cookies or site data rather than your Google account itself. Since you've already cleared your cache and cookies, confirmed that "Clear data when closing Opera" is disabled, reset the browser, verified that your Google account works correctly in other browsers, and ruled out storage issues, the next steps are to check whether Opera GX is blocking third-party cookies, deleting site data on exit, or using privacy features such as VPN, ad blocking, or tracking protection that could interfere with Google's authentication cookies. You should also review Settings > Privacy & Security > Cookies and other site data to ensure Google cookies are allowed, disable any extensions that manage cookies or privacy, and test the behavior in a new Opera GX profile. If the problem persists only in Opera GX, it may be a browser-specific bug, in which case updating to the latest version or reporting the issue to Opera Support would be the best course of action.