I always store my Z-Zero plate on my machine, touching metal. Today, my input #1 light is blinking. Seems to be a pattern of 3 blinks, then a pause, 3 blinks.......If I remove the plate from touching anything it stops. First thought was a grounding issue. I checked all my grounds, seem fine. Also checked connections in the control box, no issues. Restarted the computer and the control box a couple times, still the same? The machine zero's correctly and operates with no issue, just that blinking light! I can run it like this, it just bugs me and concerned it will lead to something else. Anyone ever had this? I run my machine (9648PRS) 3-4 days a week and have never seen this before