Under any circumstances DO NOT attempt to remove the Scout from the iOS Bluetooth device list to resolve the connection. This will break the bonded/encrypted connection to the Scout.
Firstly, try a force close of the Knog app, by bringing the app to center screen, then swipe up to close it. Reopening the Knog app should establish the connection back with your Scout.
If this doesn’t solve the issue, try restarting the Scout by briefly plugging in a charger to the USB-C port on the Scout.