Yesterday while I was trying to tune my 177 Prophet 2 I ran into an issue. Everything was going great, took a shot and started dumping air out the barrel. This had happened the first day I got it but was able to get it to stop by taking a couple shots. Not this time, dumped all its air! I did contact RTI the first time this happened and they sent me out a new valve just in case. I haven't received yet but was wondering if anything else could be the issue? I know this stuff happens but kinda sucks on a new rifle with less then a tin of pellets through it... I do have to say RTI got back to me very quickly, great customer service! Any advice would be appreciated! Thx