X axis chatter / resistance

Tried another carve. There seems to be a bit of resistance when moving left to right alone the x-axis. I’m using a Dewalt on setting 1, 1/4" bit and cutting MDF using the Easel settings.

I don’t have any kind of enclosure and to be honest this makes me really nervous to use the machine b/c I’m afraid a bit will break and fly off.

Help?