How can I prevent my iPhone 11 from freezing?

kusemererwa wrote: "The battery is on 77%and it’s the original"

kusemererwa ~ 77% is not healthy and is almost certainly the reason for the issues you're seeing. Apple recommends having the battery replaced at around 80% – so have the weak, aging battery replaced and all will be well:

iPhone Battery Service

About genuine iPhone batteries

Repair Provider Verification

(Articles found by searching Apple's Knowledge Base.)

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kusemererwa ~ As your iPhone 11 could be >5 years old, it's worth checking for a weak, aging battery. So...

Does your iPhone 11 still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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The battery needs to be replaced if you plan to hold onto the phone.

I can’t type some letters and the phone keeps opening different apps on its own

This is known as "ghost touches".

I would be very surprised if a new battery will fix this. What it usually means is that the iPhone's screen is failing and will need to be replaced at the Apple Store.....make an appointment......or at an authorized Apple service shop.

About $200-225 (U.S.) The battery is about $90 (U.S.)

You can find a lost of authorized service shops in your area by using this link:

Find Locations