Hey ldburt,
Thank you for using the Apple Support Communities! We understand you're experiencing unexpected touch issues on your iPhone X. We can help share some guidance on what to do.
Is there any physical, accidental damage to your screen or device at all that could be causing this? If not, continue below.
Try out the steps in this article to get started: If the screen isn’t working on your iPhone or iPad. One step is to see if this behavior relates to any accessories that are connected to your device. If there are accessories connected, make sure the cables are not damaged or frayed in any way.
If the issue remains, be sure to rule out possible environmental causes, such as using your device in an environment that is very humid, etc. Those types of environments could cause the multi-touch display to act differently.
You should also check to see if you possibly qualify for this Module Replacement Program: iPhone X Display Module Replacement Program for Touch Issues
Best regards.