That’s a REALLY good idea, dude.
I’m wondering how that effect would look and sound?
It might be a pain, but you could make the the saber more crackly, or wavy(?) as it becomes more unstable, and then we could see the saber either oscillate, or maybe even fade or dissipate. You could distort the regular saber sounds, like when it ignites or deactivates. Maybe you could add a spark effect sort of like what you have with Kylo’s. I mean, I think only one or two effects would be necessary to really sell it. The hard part might be masking out the blade for a few frames here and there to show it malfunctioning.