Okay, I had written a probe macro that checks for a broken tool.  Here are the basics of the macro.

Move down above the probe
Probe at 50 IPM   Here is that Probing Line of code. "G31 G91 Z -2.00 F50"
If probe strike, then "Tool OK"
else "Tool Broken"
Move to safe Z
End

It was working great last week and yesterday it stop after the probe signal was activated.  The macro was still running, doing nothing.  Now, I slowed the Feed down to 25 and it seemed to take care of the problem. 
Any ideas what happened?