Could be that your momentary switch has failed and is stuck in the “closed” position which, as I understand is rare. If this is the case, you could add a loopkey to your circuit as a way to disconnect the Stormcore from the battery instead of having to open it up to do so. You could also try replacing the switch but it’s possible that the built-in anti-spark circuit has failed in which case a new switch wouldn’t accomplish anything.
I’m def not an expert tho.
This thread may shed some light or else reach out to Lacroix directly for support.
@jaykup might also be able to shed some light.