Espresso steam wand not working with strange symptoms

I have the Breville Cafe Roma and the steam wand isn't working. I've searched all over for reports of similar symptoms to what I'm experiencing with no luck.

The pump/hot water side works fine. When I switch to steam, at first nothing happens. If I let it warm for a few minutes, eventually an extremely anemic stream of steam may puff out, and/or some drips of water. Sounds clogged, right? But if I switch to 'brew' and then quickly back to ‘steam', all of a sudden a huge eruption of steam comes out of the wand! It then quickly tapers off back to nothing. Repeating the same quick back-and-forth switch again produces a huge gush of steam from the wand.

I've tried descaler to no avail. The tip has been removed (and thoroughly cleaned, though I've just been leaving it off for troubleshooting.)

What could be going on here? I don't know enough about these machines to diagnose this. Thanks!

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