Not sure if these reports are for the iOS app, but when any app, of any type, starts acting up, it's a good idea to go to the app store site for your device. Take a look at the date of the most recent version update and then look at the reviews sorted by date to see what reports have come in since the update.
Since I use Apple devices, after seeing this thread I went to the App Store and looked at the iPhone and the iPad QVC shopping apps.
Under "version history," it shows that it was updated for both devices 3 weeks ago.
Under "ratings and reviews," I chose "see all" and then "sort by most recent."
The reports are in line with those on this thread... the app shuts down, the app crashes since the update.
So... their tech folks definitely have been deluged with complaints.
I don't use the Q apps, so I don't know how quickly those developers respond to problems.... if it's like the tech support on this website, it's probably going to take a while.
Not smart of them, since that broken shopping app is losing money for the Q.
Few things reveal your intellect and your generosity of spirit—the parallel powers of your heart and mind—better than how you give feedback.~Maria Popova