Hi ms5053,
The following steps address what you're describing specifically, and may provide a solution:
"If your screen is too sensitive or responds intermittently to touch.
- Restart your iPhone or iPad.
- Make sure that your screen is clean and free of any debris or water.
- Disconnect any Lightning or USB-C accessories. If your screen works after removing an accessory, try using a different outlet, cable, or charger.
- Remove any cases or screen protectors."
You can find these steps along with other information that may be helpful, here: If the screen isn't working on your iPhone or iPad - Apple Support
If you have followed the steps correctly and you still have the issue, let us know if you get any specific alerts or error messages when trying, as those may help us determine what might be causing the issue.
We also recommend keeping your iPhone updated so you are running the most optimized version of the iOS.
Update your iPhone or iPad - Apple Support
If you still have questions, reach out to Apple Support directly, as this may require closer guidance: Get Support
Cheers!