External I/O Strobe issue

Hello,

I’m using the external I/O bus on an RCM3000, I have 4 47 series chips hanging off the bus. One of them a 74VHC373 is having issues with noise on the strobe line, it all goes away when I put my scope probe on the line.
Does anyone have an idea as to what I can do to get rid of the noise?

Ron