I played with this problem some more last night and it IS very intermittent so it is hard to capture. It ONLY seems to happen with the Ti Omni and it only seems to happen after the tip is warm/hot. I don't think it has ever happened on the first heating. I didn't get a lot of practice in last night so I will work on it some more tonight.
Are there other users out there with JarHeads and Ti Omni's that have never experienced this? While it may be something about the Ti, I don't think the Omni condenser is a factor, so a Ti bodied UNI may suffer the same fate (assuming it is not my cap or something unique to my setup causing this).
@Summer I'm not sure how old the cap is, but it is dedicated to the LE tip I am using on the Omni as the LE tip needs a more squeezed cap. I will try to play around with different caps, and maybe a different tip...
Other than this cap they seem to move around between my different VCs.
Added: Just wanted to add that the cap works normally and well with a torch lighter. It clicks as expected. It is only with the JH there is an issue.
And Finally: OK, it's the cap. Once the cap gets hot it starts misbehaving. It does the same thing in my VongXL, it doesn't need the Ti stem to fail. I will just have to dedicate a new cap to the LE tip wherever it ends up. It is interesting that it works better with a torch and I may keep it as an emergency cap <g> but it comes out of rotation right now. I don't know if this is the reason, but it IS the most concave of my caps so there may be a little less room in there...