[webtrill]

I believe someone is tampering with the position of links submitted. I say so because last week or so, I submitted our startup to HN which was on the first page for most of the day and receiving some positive comments/feedback. At some point in the day, we were no where to be found (unless I utilized the search functionality), only to appear again on the first page after a while. Later on in the evening, it dissapeared again.

[lifeisstillgood]

That sounds a lot like flagging. cf. recent article on Margaret Thatcher that bounced in and out of existence. I actually assumed it was a moderator decision but info@ explained it got flagged dead, then put back by mods - which is almost a description of your events.

Oddly enough I have never flagged an article (except with a fat finger) - usually because I simply dont know what it does.

[mansigandhi]

Yep, this has happened to me a couple of times as well. My post would be in the Top 10 for a few hours and then suddenly sink below 30.