Ok, I can barely make my fingers type this message, but I found the cause of the problems...
The batteries in the remote control were very nearly dead. So after a few button pushes they would die, then after a while gather up a few electrons for another short sput of life.
And yes, I do feel rediculously stupid.
Thought in a slight whimper of defense, I have not had any other remote controls do this - when the die they stay dead.
Curse of the undead remote...
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