Waydroid on L5 - how do you use the Network?

Using Waydroid and Signal APK I managed to send few messages. Which lead me to a false sense of security - to use the L5 as my daily phone.
But when I left the wifi the Signal app stop sending the messages and even though I am back on the same wifi network it still does not work.
Any advice??
Thank you

Restart the phone and stay connected to Wi-Fi.