I'm not sure whether it is relevant or not, but when I use follow the link from the maker's website to get the mobile app from the App Store. I am told that it works ONLY on iPhone, not on iPad. (This is the Mac App Store telling me that.)
When I look it up directly in the App Store on my iPad Pro, it says in requires iPadOS 12.4 or later. I assume you have that, or it should have refused to install it.
Maybe the iPadOS version is still flaky, maybe flakier than the iPhone version.
Also, I note that version 3.11.2 was released a week ago with unspecified bug fixes. Make sure you have the latest update.