This is how I resolved a slight flicker on my 64x32 LED display.
Put a jumper wire on pins 18 and 4 on the bonnet.
Edit /boot/config.txt - Ensure the below is set to off
dtparam=audio=off
Ensure this flag --led-no-hardware-pulse is NOT used when running your demos / examples
My example
./demo -D 4 --led-rows=32 --led-cols=64 --led-gpio-mapping=adafruit-hat-pwm
Adafruit RGB Matrix Bonnet - How to solve flicker.
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