This has happened to me twice - and from what others say, to them a lot too.
It's a serious issue. Dno't get me wrong, it's not like I'm saying anything valuable but dammit, the only time I want my threads to disappear is when they're deleted by moderators because I'm being a twat (which to date has never happened unless this is what's happening now).
Soooo.... can this issue be resolved. It's a massive annoyance. Like more annoying than getting to the train station in the morning and realising you've left your mobile at home or summit.
Cheers Sean / Theo / Other techy type people YEAH!