My favorite problem is "Hey Siri, navigate home" proceeds to open navigation and send me to a place that isn't my home. I can up open maps manually and click on "home" and it works totally fine, but for some reason, Siri finds a place called "home" that isn't actually my home to send me to.
"Hey Siri, turn off my alarm" (ignores me)
"Hey Siri, turn off my alarm" (ignores me)
"Hey Siri, I'm going to buy an Android" (turns off alarm, refuses to elaborate)