All my programs are over traveling at a G28 command. We've been using this command for years I don't know what changed. I am not the only one that operates the machine, others do, so I don't know if someone changed something.
Example of code up to failure:
N5 G21
N10 S100
N15 M19
N20 G91 G28 Z0.
N25 G28 X0. Y0.
Any ideas?