iPhone 14 always freezes and have to restart often,

Hello renatsplace,

Do you need to take these steps to solve the issue, even if it is temporary: If your iPhone won't turn on or is frozen - Apple Support

If you've already owned the iPhone for 2 weeks (passed the 14 days) then it is passed the return/exchange window, if it was purchased through Apple directly.

With that said, we'd like to ask some questions to better understand what's going on. What are you doing when this occurs on your iPhone? Are you using it at the time this occurs? If so, are you doing a specific task or using a specific app? Did you restore from a backup or set it up as new originally? As these answers will help us to isolate the behavior further.

Make sure the iPhone is up to date and that all apps are also updated:

Update your iPhone or iPad - Apple Support

How to manually update apps on your Apple device - Apple Support

Hoping to hear back, take care.