f the sound does sound good when you when playing music via Bluetooth then we recommend trying the following:
Delete the Google Home app from phone or tablet.
Then reset the Citation Oasis
To restore the factory settings, press and hold the reset button on the bottom of the device for about 5 seconds. The device will then reboot and is then ready to be (re)configured via the Google Home app.
Reinstall the Google Home app and perform the setup preferably when your phone/tablet is connected to the faster 5 GHz WiFi home network.
If you have a standard provider router with a 2.4 GHz and 5 GHz WiFi home network we advise you to separate these two bands by giving the 2.4 GHz and 5 GHz networks a separate SSID (network name) and password. This requires a brief login to the router.
If you do not know exactly how to do this, we advise you to contact your internet provider. They may be able to adjust this for you over the phone.
After that, make sure you connect the phone or tablet to the faster 5 GHz WiFi home network before you run the setup again.
If you have made changes in your network settings, make sure all your devices are logged on to the "new" network and make sure you forget any other networks your phone/tablet can automatically connect to.
This article describes how to avoid possible interference.
NOTE: This article is intended only as a solution to problems encountered when casting music over WiFi. If there are issues with using the DAB radio, please consult the product manual.