Sucks, I know. It's happened to me. I've also lost a few derbies because I receive texts that keep me from paying attention to the ball.
Best advice I can give is if you're doing something incredibly time consuming, like the Super Slugger event, turn your cellular data off but keep the Wi-Fi on while having yout phone's Wi-Fi calling disabled. It's an extra step, yes, but at least it'll keep you from being interrupted while you get that slugger.