I took a look and the last two snipes you have lost were "Not In Time." One snipe was set with a 2 second lead time, which we do not recommend at all. The other, however, was at 5 seconds which we do recommend.
Was Auction Sniper at fault? If you take a look at the snipe confirmations you will see that your snipes were sent to eBay exactly when they were susposed to. But eBay did not receive them in time. After we send eBay your bid, there is nothing else we can do. This is why we have a page describing the risks of sniping:
http://www.auctionsniper.com/?p=risksDue to factors like internet traffic or eBay server problems, we cannot gaurantee that your snipe is placed on time, but 99% of all snipes at 5 seconds are placed perfectly.
Sniping is not foolproof. It is a game, and if your willing to play it you must be willing to accept the risks.
Adam R.