Note: Motion enabled after reaching a coordinate soft limit with active external

Hello everyone, please, i need your help.
Everything worked perfectly, but after a few months, from time to time when I turned off the machine from the electricity, the Z axis went down and linuxcnc listed this error - Note: Motion enabled after reaching a coordinate soft limit with active external offsets

After a while, this message began to appear after pressing Estop. The Z axis drop down again and displayed this message. - Note: Motion enabled after reaching a coordinate soft limit with active external offsets

But today, in the middle of the program, the machine stopped, the Z axis drop down again, and this message came out again. - Note: Motion enabled after reaching a coordinate soft limit with active external offsets

If I cancel this error with a cross, I have to homed the Z axis again and can continue.Could someone please advise me why this is happening and how can fix it? Thanks.

I attach my .ini and .hal file.
  

Usually that means the limits are not set correctly, acceleration is to high (rarely), or using offsets that are causing overrun.
Not able to help much as you did not mention what version of LinuxCNC, what GUI, is it a stepper or servo system etc.
From what i could gather with the falling Z, it seems a servo system with loop closed in LinuxCNC, so that would mean none of the above are to blame, the falling axis is to blame as it is going over the set limit, so that has to be fixed in hardware, not software.

My first question would be "Do you know you are using external offsets, and why?"

But, you are hitting a soft limit. That is an error. Maybe you need a brake on the Z axis if you expect to power off the machine without hitting the bottom of Z.

In most GUIs you can click an override and jog off the limit switch, but is re-homing Z such a chore?