Left Side of touch screen not working properly.

You just described a possible hardware failure that occurred just after a software update.

While this is unfortunate, it is not uncommon.

However, only an Apple Genius can review the cause and provide a complete solution.

Therefore, I recommend service.

Service Checklist:

• iPhone service pricing.
• Check AppleCare Coverage.
• Get your iPhone ready for service.

Click ▶︎ Start a Repair Request.

Need more help?

• Call 1-800-APLCARE.
• Contact Support.
• iPhone Support.
• iPhone User Guide.

Click ▶︎ Check Repair Status. 🔧

Good luck! 👋🏼😉

Your iPhone X's screen is failing.

To confirm, make an appointment at the Apple Store or take the phone to an authorized Apple service shop for repairs.

You can find a list of authorized shops in your area using this link: Find Locations

Good luck.