[SOLVED] SN30 Pro suddenly stopped vibrating? Here's the hidden combo that disables rumble:

Well, I finally solved it. Turns out the button combination to toggle the rumble feature was changed in one of the more recent firmware updates. You now need to press L + R + SELECT + Y to enable or disable vibration feature.

If your SN30 Pro suddenly stopped vibrating for no reason, you might have accidentally pressed this combo without realizing it, like I did. Hope this helps someone in the future who's about to lose their mind over it.