I’m guessing this was a recent change on Apple’s part. I have had my Spider V for over a year and have only experienced this problem during the last 2-3 months. Prior to that, I was able to leave the app running in the background, bring it forward to make adjustments and it would never freeze (no matter how long it had been running in the background). This is a relatively recent issue with the app. Also, I don’t have this freezing issue with any other apps. Not sure that this helps you, though.