Hello,
I have the same trouble, screen blackouts. Theses troubles stop immediately if I stop Hyperion with HyperCon.
At now, my config is:
-Raspberry Pi 2B+ and Raspberry Pi 3
-SK9822 (300Leds)
-LibreElec/Kodi
-30A LEDs power supply
-2.1A Raspberry Pi power supply
I used default configuration of HyperCon (46LEDs), I just changed HW type in order to have the LEDs working.
I tested without connecting DATA/CLOCK GPIO pins of the raspberry Pi, still blackouts.
I also made a test with Arduino nano as intermediate, using Adalight and AdalightAPA102, same result...
What could be the cause of this problem? Any suggestions or solutions? I will try to install OpenElec as suggested by m717, I hope it will works.
Edit: It seems to be OK with OpenElec 8.0.4. Is there a solution to have Hyperion working with LibreElec (simple to have multi boot with Raspbian using Noobs)?