same thing here,
i tried uninstalling and reinstalling, tried router resets (as suggested in AnswersHQ), ended up borrowing another iPhone just to claim rewards and to see if it woking there. (and it is..)
so here’s my summary:
using iPhone 6s , iOS 11.1.2 , declared Compatible in swgoh appstore:
Disney • LucasfilmLtd (on black bacgroud)
then, SplashArt (blue/red backdrops) 5mb downloads.
then, 19mb downloads, screen changes into bluebackground “Loading...”
but soon after the 19mb downloads, music starts playing then gargles the sound a bit then game crashes and boots out to Home.
using iPhone 6s Plus, iOS 11.1.2 : installed, (logged in my gamecenter assets), started App; worked perfectly fine.
soooo, as Kenan’s snL character used to say :
“Heh heh heh heh heeeeeyyyyy!!!! Ooooouuuuiiieeeee (tewnenewnt!) What’s up wit that?! whattup wit that!?”