I don't know if Hyatt hired people from Marriott's IT department, but the app has been extraordinarily buggy these last few months. I get frequently logged out, quitting the app entirely logs you out, mobile keys don't register with ease or work, my upcoming stays disappear, I've had glitches in pricing and flow come up when making reservations and just about everything takes ages to load. I've reached a point where if I see an update for the app in the App Store, my insides clench because I feel like for one thing Hyatt will fix, twenty other things will break.
Sigh.
khabah