Ours is only a few weeks old. It's been absolutely fine, but then last night it started to make a loud sort of crackly noise.
The only thing I could see was that it was running low on rinse aid, which I've now topped up.
It made the noise again briefly when I switched it on again, but now seems ok. I wish things would just go wrong if they're going to, then I'd know where I stood! Anyone else had this?