I had a look around and couldn’t find anything similar to this issue. I’ve got a unicorn hat, which after a while having anything running with a “high” brightness level gets three of its LED rows stuck into whatever state they are when it happens.
This is a picture illustrating my issue, this happened after less than 1 minute running the random blinky example (https://github.com/pimoroni/unicorn-hat/blob/master/python/examples/random_blinky.py#L7) modified at the highlighted line to a brightness of 0.9.
I need to power it off for a few seconds before it works again. Has anybody experienced anything similar?