Blocking Course Progress on LMS Communication Loss

Hi everyone,
we're working on a SCORM course developed in Articulate Storyline, and we’re trying to implement a specific client requirement — but we’re stuck.

The requirement:

If the communication between the course and the LMS is interrupted, the course should:

• block any further progress, and
• display the following message:

Warning! Communication with the platform has been interrupted.
Please close the course and reopen it after checking your network connection.

What we've tried:

Normally, we manage this kind of behavior directly through LMS settings, but in this case, the client insists that the logic must be handled within the SCORM itself.

We've tried everything we could think of to detect communication loss and trigger this behavior from within Storyline — but nothing has worked so far. At this point, we honestly don’t know what else to try.

Has anyone faced a similar situation?
Is there any workaround or JS-based solution that could help us detect LMS connection issues and respond accordingly from within the SCORM?

Any help would be truly appreciated!

Thanks so much in advance,
Andrea