My iPhone X screen freeze
Sometimes my iPhone screen doesn’t respon can’t answer or decline the call
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You can check out these guides:
Get help with the display on your iPhone, iPad, or iPod touch - Apple Support
If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support
If you want to rule out software issues, you can set up your iPhone as new via iTunes. This will download a new iOS from Apples servers. If it keeps happening even after that it is probably a hardware issue. and you will want to contact apple for service options.
Restore your iPhone, iPad, or iPod to factory settings - Apple Support