IPhone 8 Plus freezing all the time when i you h screen

Hi Vichany,

Thanks for using Apple Support Communities. We understand you are experiencing some unexpected behavior with iOS device. We're happy to share some tips that can help improve performance.

•Check your network conditions. Even if your device indicates a strong signal, you might need to wait, try again in a different location, or use available Wi-Fi. If you continue to experience issues with cellular data speed, availability, or performance in multiple locations, contact your carrier.

•If an app stops responding or freezes, you might need to force it to close and then open it again.

1. From the Home screen of iPhone X or later or an iPad, swipe up from the bottom of the screen and pause slightly in the middle of the screen. On iPhone 8 or earlier, double-click the Home button to show your most recently used apps.
2. Swipe right or left to find the app that you want to close. 
3. Swipe up on the app's preview to close the app. 

•Make sure you have enough storage

You can check your device's storage in Settings > General > [Device] Storage. For best performance, try to maintain at least 1GB of free space. If your available storage is consistently less than 1GB, your device might slow down as iOS repeatedly makes room for more content.

If you need to free up some space, follow these steps to turn on the storage-saving recommendations built in to iOS or iPadOS:

1. Go to Settings > General > [Device] Storage and read the recommendations that iOS or iPadOS might provide.
2. Tap Enable to turn on a recommendation, or tap a recommendation title to review the content that you can delete.

•Leave Low Power Mode off when you don't need it

•Keep your device from getting too hot or cold

•Look at your battery health

iOS can show show battery health and recommend if an iPhone battery needs to be replaced. Go to Settings > Battery and tap Battery Health. Battery Health is available only on iPhone.

You can find details on each of these suggestions here: About iOS or iPadOS performance on your iPhone, iPad, or iPod touch - Apple Support

Thanks