I had a similar situation come up a couple of days ago. I filed a problem report and here is the response I got. The response is easily understandable but it would help if AS posted the info for "did not win" under general information so we would not have to ask around for the explenation.
Here was the responose, best of luck to you:
Almost all Did Not Win and Not In Time messages are due to lead time. The default 5 second lead time, while adequate for most weekday situations, just isn‘t enough for evenings and weekends. And anything under 5 seconds is strongly not recommended.
We snipe from an atomic clock which calibrates our servers. We snipe every auction at least 3 times ---from 3 different servers and locations. 2 snipe exactly on time, and one server tries to adjust for eBay server lag according to how long their average server is taking.
Remember that it‘s in our interests for you to win: if you don‘t win, we don‘t get paid---so we do our best to see that you do indeed win!
You should increase your lead time to 7-12 seconds on auctions that close 5-11 p.m. PST, and on weekends, when eBay traffic is heavier.
There are risks to sniping. No service or software guarantees your wins. Here‘s the link to our page on this:
http://www.auctionsniper.com/risks.aspx