I'm experiencing almost exactly the same issue on my iPhone 16 running iOS 27.0.1 (24A446). Several unrelated apps, including Bilibili (9.13.0), Hollister (16.3.0), and occasionally DoorDash, randomly become stuck on their splash screens and fail to launch properly. Most other apps, including YouTube, Instagram, Amazon, and WeChat, work normally. Safari also works without any issues. I've noticed that the problem often occurs after an app has been left in the background for an extended period and subsequently terminated by iOS. For example, if I pause a video in Bilibili, leave the app in the background for several hours, and then reopen it, the app may become stuck on the Bilibili logo indefinitely. Force-quitting the app does not resolve the issue. Interestingly, the affected apps sometimes recover spontaneously without any intervention. Troubleshooting steps I've already tried: Restarting the iPhone Switching between Wi-Fi and cellular data Resetting network settings Updating iOS and all affected apps Checking for residual VPN configurations or device management profiles (none found) Deleting and reinstalling Bilibili, which temporarily resolves the issue for approximately two days before it recurs The iPhone also has over 92 GB of available storage. My iPad does not experience the same issue. I examined the diagnostic logs for both Bilibili and Hollister, and found a particularly interesting similarity. Both apps were terminated by the iOS watchdog with 0x8BADF00D and SIGKILL. Bilibili: WatchdogEvent: process-exit, failed to terminate gracefully within 5 seconds. Hollister: WatchdogEvent: scene-update, exceeded the 10-second time allowance. Despite the different watchdog events, the main threads of both apps were blocked in the same synchronous XPC call while setting up a background NSURLSession: mach_msg2_trap xpc_connection_send_message_with_reply_sync __NSXPCCONNECTION_IS_WAITING_FOR_A_SYNCHRONOUS_REPLY__ -[__NSURLBackgroundSession setupBackgroundSession] This strongly suggests that the two failures may involve the same underlying background networking mechanism, although the logs do not establish the root cause. Since this affects multiple unrelated apps on the same device, I suspect a possible issue involving the iOS background URLSession service or its interaction with these apps, rather than an isolated application bug. Waiting for solution.