I use Android devices and have the same, well... similar problem.
When I open the WGT app, it runs for a while, then suddenly crashes and kicks me back to the home screen.
Not a dramatic issue during solo tourneys since I can just tap back in and resume, but I’ve lost a handful number of coin room matches and been labelled a quitter several times because of this. (Nope, I couldn't return and resume because the match just disappeared.)
This issue has been ongoing for quite some time, possibly since the update before last.