I'm also using WKWebView to display help content in an app. It's embedded in a view that's displayed by a view controller when required, and the help served through a website and loaded but exactly 30 seconds i see the page starts flickering and then it just crashes, I also get similar error Error acquiring assertion: Error Domain=RBSAssertionErrorDomain Code=3 "Target is not running or required target entitlement is missing" UserInfo={RBSAssertionAttribute=RBSDomainAttribute| domain:"com.apple.webkit" name:"Background" sourceEnvironment:"(null)", NSLocalizedFailureReason=Target is not running or required target entitlement is missing} ProcessAssertion: Failed to acquire RBS Background assertion 'WebProcess Background Assertion' for process with PID 41741, error: Error Domain=RBSAssertionErrorDomain Code=3 "Target is not running or required target entitlement is missing" UserInfo={RBSAssertionAttribute=RBSDomainAttribute| domain:"com.apple.webkit" name:"Background" sourceEnvironment:"(null)", NSLocalizedFailureReason=Target is not running or required target entitlement is missing} during this flickering i also observed that didFinishNavigation is being called even though there is no response from the server