Since ios17.4 began to have different projects, there have been similar problems, the same one has been online app, some mobile phones can not access the local network, some mobile phones can, sometimes the phone can be turned off and restarted to recover, some can not recover. Go to the app's permission Settings page in System Settings to check that local network permissions are enabled. Until the latest 18.3.1 still has this problem. Urge Apple to check this issue.