HFC Heavyweight Jamming issues

[Higson1989]

Bought a HFC heavyweight 92F around 2 weeks ago, and I'm having some difficulty with it.

Recently, the slide has started sticking as I prime it back, and then when I pull the trigger, the hammer doesn't fall completely and the gun refuses to fire. If I apply pressure to the hammer, the gun goes off. Seems like a really odd problem to have.

I tried lubing the pistol, and it appears to be having no affect. Any advice?