Plummet in laser power

Hi all! I’m using a JPT 50W fiber laser, and recently the power output plummets roughly a fraction of a second into a marking sequence.

This gif shows what should happen (before this issue arose):

And this gif shows what has happened (note the absence of sparks after a fraction of a second):


I have been using the exact same parameters, and both are in focal plane for sure. Has anyone experienced the same issue or have any insights to this problem? Any feedback is much appreciated!