I haven't necessaraly lost interest in a build but with work and all the othere distractions going on in life, its easy to let a project sit and collect dust for a time.

I am at this point in a couple of projects myself, I just got some retracts for the plane I am working on, for some motovation to get going on this project, its been sitting for way to long in a nearly finished state.

I find if I buy a little part or accesory for a project it helps get the drive back to at least get a section of the project done, small steps lead to larger ones etc...since I primaraly build wwII fighters there's alot of little steps to get done