Someone just has to pass you in points, the cut number can move up and I guess it does in most tiers close to reset.  g4 has mystery cut lines so you never know where you will end up Monday morning

Hah no- I'm definitely too lazy to be there. This was going from Silver 1 down to Bronze 4 lol. And I'd be shocked if in the last 30 minutes, the cutoff moved so far up that I went from being promoted to being demoted.

Did you get in the requisite number of fights this week?

Oh. Yeah that's possibly it ... not sure if I needed 10 fights to get into promo range. Though ... that feels unlikely?

this is one of those where only you and support will have a realistic idea. you can always check in with them if you're unsure/unconvinced. :)

So you don't do PvP (tag, live) at all?

Correct 

are you doing much in the game these days or is it just full AFK mode now, save for fusions?

Pretty much, yeah. I do daily cb, doom tower, and usually twins, and weekly top chest on nm brutal and hard hydra. Not much else outside of fusions.