Ever since upgrading my iPad 2 to iOS 9.3.5, Lemur locks up any time I switch away from it. If I switch to another program then come back, or if I turn off the iPad and turn it on again, Lemur locks up. Pressing any of the buttons on my controller or the Gear/settings icon do nothing. I need to quit the ap and restart it, every time. Any suggestions for this? Thank you.