Samsung and software...
Our Samsung TV has the subtle and obscure bug that when selecting to fast-forward DVR playbacks, if the button is held down for more than two seconds it crashes so hard that the mains power has to be removed to reboot it. What makes the bug extra easy to find is that unless you hold down the button for the first second it doesn't even register the attempt.
On the bright side, I guess with software so crap the only way forward is up...