When I connect my unicorn hat hd to a powered up pi, it immediately starts flashing a whole line of LEDs at a pretty high brightness, the unicorn hat board begins to heat up, and the pi resets. The line of LEDs flashes 3 or 4 times, and then everything stops, but the board keeps getting hotter.
This started to happen after I began to run the hat using individual jumpers (as specified here: https://pinout.xyz/pinout/unicorn_hat_hd, but with only one ground pin connected). This worked fine, but then after a while (an hour or so?), switched to the error I described above.
I’ve tried the same hat on both a pi 3B and 4B, with the same problem showing up. Even if I run any of the examples, or run the hat as designed, with all the GPIO connected, nothing changes and the error persists.
I was wondering if there is anything I can do to debug it, or if the problem is permanent?