I've been superstitiously switching between "turn the lights off" and "turn off the lights" (also with music). It seems like every few weeks or days it prefers one over the other.
I say to Siri “close the blinds” eyes and it replied “I don’t see anything like that in your home”. I say again five seconds later “close the blinds” and it closes the blinds.
I have the same problem with my “blinds” - I started calling them “shades” instead (not the usual term, in my vernacular at least) and have had much better luck. YMMV!