May I make a request that new topics and posts don't disappear quite so quickly? Several times recently I have seen something and thought: "I'll watch/listen to that later" only to find it's gone next time I log in and I can't remember who posted it or where (encroaching senility, I know). If new posts could stay up for a day or two that would be fine.
Unfortunately, tinkering with the site setup is outside of my remit - I can only deal with membership/logon issues. We need Zee to do anything to the way in which the site operates, and I don't think he's logged on since October 2014. I can confirm that no-one is removing posts (unless the original poster removes something for whatever reason); they are simply slipping down the timeline as new posts are added.
Personally, I use the 'New posts' feature to keep track of new stuff, and then rely on my diminishing powers of memory to go back to look for stuff I couldn't view properly first time around. I suspect that the 'Bookmark' feature might be useful to both of us Adam.