With RMS Mix you have the option of running your content from a Mac/Windows computer, a phone or a tablet. It's best to give a restart to all of these devices prior to rehearsals/performances and make sure there are no other applications running.

To kill apps on Android, follow the instructions found here.

To kill apps on iOS, follow the instructions found here.

You should also put the phone into airplane mode and be aware of any games/apps that throw notifications. If you're able to delete them, please do. If not, make sure notifications are turned off.