Periodically the timeline jumps to a different part

The way I've discovered to make it go back (rather than searching) is by pressing UP or DOWN because it turns out the playhead itself doesn't move; just my view.

I've looked into whether I have any weird triggers in better touch tool but I can't find anything. I'm wondering what is causing it to do this. it does it so often that I think it must be a case of me swiping the trackpad accidentally plus a modifier or something.

Let's say it happens again; i want to be ready. How can I work out what keys were pressed in order to have Final Cut Pro X do this? Console give me too much information. Activity Monitor not enough.

Do you have any ideas? I want to be able to monitor what inputs Final Cut Pro X is getting and where from.

Thanks.

If it happens frequently enough, try doing a screen recording as you use FCPX and highlight mouse and keyboard strokes. Or, put a small video camera shooting your keyboard and screen. If it happens once or twice a week, then obviously this isn't a solution.

It sounds you’re seeing an old bug that is rather like a ghost now as it sometimes still pops up. Originally this ‘random’ jumping towards the head of the timeline happened w all sort of edit operations. It was mostly fixed by Apple but I’m still seeing it on edit operations on secondary storyline’s. I submitted it again to Apple feedback some time back and forgotten now what exactly triggered it. Main thing is that you’re not doing something wrong but that it is a bug in the software

I have that occassionally too, it's a bug. I can SOMETIMES fix it by creating a new timeline and copy/pasting the faulty project. Duplicating wont work as that just duplicates the bug. And PLEASE file a bug report with Apple.

Disable better touch too and reboot, see if that makes a difference.  If so, you may have better touch tool set up incorrectly somehow.

I have that completely uninstalled, ddin't fix.

What Mac model, year, config, macOS version, FCP version?