If we are not logged in to itunes, we are getting a sandbox login popup every time we launch our app
or bring the app from idle (minimized as icon) into the foreground to make it the main running app (we are not considering
multitasking on ipad at this point).
iOS10.x, build on xcode7.3
There seems to be minimal or documentation on what is causing this. We are not trying to check receipts at app startup,
we defer it for 20 seconds to avoid interfering w/ the app launch (e.g. the login popup), but yet the login popup occurs anyway.
Additionally the login popup seems to be coming from a system process not our app process because it stays on screen if we kill our app.
There were some postings about lingering partial transactions and we tried to solve this by finishing all transactions,
but that did not solve it.
Any clues?