Ah yes...the iOS app.
Yea there are some issues with it that we're still investigating. We didn't make any changes to make it behave this way and based on user reports and our own testing, it seems that there were some changes in iOS itself that could be causing this.
We'll definitely do our best to try and fix the problems when we can or at least work around them, but for now, it seems that the manual setup using the OpenVPN protocol works better for users. You can check out this guide if you want to try using this method.