My probe touched the table like it didn't know it was there. We had this problem way back when we first got the machine, and Rod Garret fixed it. I haven't had a problem since then.  Today my probe went to change angles and it touched the table. I had the switch turned down super slow so it was barely a touch. I can change the path so it's not an issue, but why  did it go from knowing the table is there ....to not knowing?