My Aura 1TB lost all recordings yesterday, including some "locked" ones, although the disk usage figure suggests that they are still on the Hard Drive.
Coincidentally it also popped up a message that a recording failed due to a loss of power, but indications suggest there was no loss of power to the house.
It's so annoying. It's the 4th Humax I've owned (previously 9200T, 9300T, 4000T) butthis Aura seems the most temperamental.
I've just switched off and pulled out the mains plug, made a cup of coffee, then switched on again and there's still no recordings. So I re-formatted the Hard Drive and will keep my fingers crossed.