App running in debug on iOS freezes every 3 seconds if not connected to the same network where metro runs

[mrAlmond]

Description

When running an app on iOS in debug mode, if we connect the phone to a network without internet access (and where metro server is not reachable) we experience periodical UI freezes every 3 (more or less) seconds.
When we switch back to the original network (and the metro connection is established again) everything runs smooth again.

Steps to reproduce

1. Run the application in debug using yarn start and then yarn ios
2. Connect the phone to another wifi network without internet access
3. Try to use the app, you will notice periodical freezes.

React Native Version

0.78.3

Output of npx @react-native-community/cli info

info Fetching system and libraries information...
System:
  OS: macOS 14.7.1
  CPU: (11) arm64 Apple M3 Pro
  Memory: 532.41 MB / 18.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 18.17.0
    path: ~/.local/share/rtx/installs/node/18.17.0/bin/node
  Yarn:
    version: 3.6.4
    path: ~/.local/share/rtx/installs/node/18.17.0/bin/yarn
  npm:
    version: 9.6.7
    path: ~/.local/share/rtx/installs/node/18.17.0/bin/npm
  Watchman: Not Found
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.2
      - iOS 18.2
      - macOS 15.2
      - tvOS 18.2
      - visionOS 2.2
      - watchOS 11.2
  Android SDK: Not Found
IDEs:
  Android Studio: 2025.1 AI-251.25410.109.2511.13665796
  Xcode:
    version: 16.2/16C5032a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: javac 17
    path: /Users/admin/.local/share/rtx/installs/java/oracle-17/bin/javac
  Ruby:
    version: 3.2.2
    path: /Users/admin/.local/share/rtx/installs/ruby/3.2.2/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 15.0.1
    wanted: 15.0.1
  react:
    installed: 19.0.0
    wanted: 19.0.0
  react-native:
    installed: 0.78.3
    wanted: 0.78.3
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

info React Native v0.82.1 is now available (your project is running on v0.78.3).
info Changelog: https://github.com/facebook/react-native/releases/tag/v0.82.1
info Diff: https://react-native-community.github.io/upgrade-helper/?from=0.78.3&to=0.82.1
info For more info, check out "https://reactnative.dev/docs/upgrading?os=macos".

Screenshots and Videos

No response

[react-native-bot]

Warning

Unsupported version: It looks like your issue or the example you provided uses an unsupported version of React Native.

Due to the number of issues we receive, we're currently only accepting new issues against one of the supported versions. Please upgrade to latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If you cannot upgrade, please open your issue on StackOverflow to get further community support.

[react-native-bot]

Warning

Missing reproducer: We could not detect a reproducible example in your issue report. Reproducers are mandatory and we can accept only one of those as a valid reproducer:

• For majority of bugs: send us a Pull Request with the RNTesterPlayground.js edited to reproduce your bug.
• If your bug is UI related: a Snack
• If your bug is build/upgrade related: a project using our Reproducer Template

You can read more about about it on our website: How to report a bug.

[react-native-bot]

Warning

Unsupported version: It looks like your issue or the example you provided uses an unsupported version of React Native.

Due to the number of issues we receive, we're currently only accepting new issues against one of the supported versions. Please upgrade to latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If you cannot upgrade, please open your issue on StackOverflow to get further community support.

[Racha2004]

unable to reproduce it , reproducer is missing.