I've recently noticed a bug on the Stack Exchange iOS app. When I open the Stack Exchange app on a weak Wi-Fi signal, it hangs on the blue load screen as it launches and either crashes the app or the entire phone lags and doesn't respond for about a minute.
I'm running iOS 8.4.1, I have the most up-to-date version of the app, and by a 'weak' Wi-Fi signal I mean two out of four bars of strength.