I have also had issues, except on Android. Admittedly, I am using a rather old smartphone now, a Note II, which my carrier has only allowed to update to Android

I have also had issues, except on Android. Admittedly, I am using a rather old smartphone now, a Note II, which my carrier has only allowed to update to Android 4.4.2. Whenever I try to order something through the starbucks app, I have to try multiple times because at some point in the ordering process the message, "unfortunately starbucks has stopped," or something like that will pop up and the app will close. Usually no progress is saved. Often it will crash right as it is processing the payment, and when I open it back up I have to go to the order history to check to see if it went through. Usually if I make it that far before it crashes then my order will have been submitted successfully. I would love to be able to skip the UI and just submit my order an alternate way, but maybe the answer is to just stop being so cheap and to get a new phone.