When I switch Apps I lose my sound.

Hey there Nooperation,

Welcome to Apple Support Communities. We understand that you're experiencing an issue with unexpected no sound when you switch apps on your device.

First off, let's be sure your iPhone is up-to-date. Here is how to check: Update your iPhone, iPad, or iPod touch

Next, we want to be sure your Ring/Silent switch is set to "off": How to put your iPhone on vibrate, ring, or silent mode

Last, we'll have you ensure all apps are up-to-date as well: How to manually update apps on your Apple device

These suggestions should help. Let us know if you have any questions.

Kind regards.

Thank you for getting back with us. If you're still having issue, we recommend contacting Apple Support for further assistance. You can reach them here: Contact Apple Support