Similar to the question about the "wand power", I'm curious if a wizard can run out of power by other means than death.
This quote lead me to ask my question especially because Ariana had some issues with handling her magic powers and with her character there are always mentioned squibs:
It destroyed her, what they did: She was never right again. She wouldn't use magic, but she couldn't get rid of it; it turned inward and drove her mad, it exploded out of her when she couldn't control it, and at times she was strange and dangerous. But mostly she was sweet and scared and harmless.
Harry Potter and the Deathly Hallows, chapter 28
In some other movies/series/books there's always at least a tiny mention of "draining" a wizard's power dry. So, if not naturally i.e. by having mental issues (Ariana still had magic powers in some crippled form I presume, until death), does JK state anywhere some other means how would a wizard run out of power directly or by an action of other wizard? Probably a plothole around Ariana's character?
Maybe there was a person in St Mungo's hospital or something?