I've read good reviews on Raspberry Pi4 so I decided to replace my NUC 8i3 by Pi4.
I purchased Raspberry Pi 4 Model B (4GB), installed LibreELEC-RPi4.arm-9.2.0.img and tested on 4k TV. It didn't play smoothly, freezing every several seconds. I blamed software so I installed LibreELEC-RPi4.arm-9.2.0.img on new SD card but have the same results. I tried 2160p/24fps, 1080p/60fps, 1080p/24fps. Movies are freezing. I don't use WiFi, just Ethernet cable. Frustrated I contacted seller but they claim that all Pi4 are tested and that they have no returns.
I purchased Raspberry Pi 3 B+, installed LibreELEC-RPi2.arm-9.2.0.img and it works perfectly from the start. Plays movies 1080p/60fps on the same TV connected to the same Ethernet cable.
So NUC works perfectly up to 2160p/60, Pi3 works perfectly up to 1080p/60, but Pi4 doesn't. Should I try something else or just return Pi4 and ask for replacement.