Wow, sorry it took me so long to see this. I know Jake, at least in passing, we're both part of C.V. Wartooth's 'Lunchtable Clique', but so is just about everyone, it's a big group.
But yes: From what I remember vanishing with no explanation and sometimes the occasional cryptic note is kind of his MO. I'd say it's mine too, but my dad's a telepath, so, it's a lot harder for me to up and vanish than it is for some people.