iPhone X clicking by itself

See if your device falls into this group, iPhone X Display Module Replacement Program for Touch Issues - Apple Support

If it only happens when it is plugged in you need a new Lightning cable.

If it happens all the time you need to have your display replaced by Apple because the screen digitizer is failing.

Hi! Your IPhone is clicking by itself?

Have you tried restarting your device? https://support.apple.com/en-us/HT201559

This could also be a hardware issue.. You can contact Apple suport https://getsupport.apple.com/

Or go to an Apple Retail Store

Regards

Nicki