It's firmware bug that has been fixed. Can you please check from the WiiM Home App if your device firmware is updated to version of 4.6.419430 or newer version? If not, please reboot your device and it will be automatically updated shortly.
If you're using 2.4 GHz and 5GHz dual band router (most of us are using it nowdays), please follow the advice given in this tutorial to configure your router. It'll make your connection with WiiM faster and stable.