Xojo scripts stop working

Windows 10 / XOJO 2018r4

I have some Xojo scripts for adding © headers and Footers in my code.
I also use a code format script.
All these scripts work very well.

But at some moment they stop working.
They can not be launched anymore from within the IDE.
Closing XOJO and reopening solves the problem, but the problem reappears after a while or actions !

It is not necessary by using the script to make them stop working.
It also happens when I program and at a moment I try to launch a script, but it doesn’t work.

I was not able to detect when exactly, or for what reason they stop working.
Is this a known bug or should I start a feedback.