ilchenko That is known bug - for some reason H264 videos with width > 2048 are not decoded properly on H6, but are ok on H3 and A64. I'm in the process of reworking Cedrus patches and along I try to fix known bugs. This is the only one which is not fixed yet. I'll upload test images soon.
No network after rebooting OrangePi 3 is also known bug. I'm not sure when I'll have time to look into it, but I suspect what could be the issue. Current workaround is to shutdown the board, remove power supply for a few seconds (LEDs should stop shining) and then power it up again.
tweeKpot HDMI audio was reworked, mostly due to big upstream changes. I'll ask one expert to look into this.