Dear me, didn't you two even stop to read the reply to millicentd on the same subject? For the record,
snipes placed on Sunday must allow a greater lead time, at least 15 seconds, because that's eBay's busiest time. There is such a crush of last-minute bids, most of them by proxy bidders, that eBay's servers cannot keep up and a lot of bids, probably including yours, don't reach eBay's servers in time to be registered. This is not an AS problem. Click on the small "search" icon at the top of this page and search for "Sunday" and you'll find that this topic has been answered dozens of times in the past.
Snipers have some advantages, but they also have to do their homework.