I also have an H series crashing problem as well with a UN75H6350. The crashing has been occurring for probably close to a year. For me, the Emby app crashes (app just disappears) usually when starting or resuming after pausing, it rarely crashes while playing.
It seems like it crashes when the bottom menu appears showing the pause, play, rewind, and fast forward buttons. The reason I say this is because a TV show or movie will start to play once you click play on the remote and then for a fraction of a second you see that bottom menu bar start to appear before the crash.
The TV is running the latest firmware.
I also have a UN43J5200 series running Osray which doesn't experience this issue.