Plugin unresponsive on linux machine

[NyakudyaA]

Problem

I have installed the plugin using the https://download.giswater.org/plugin/3.4/giswater.xml
The first time I click on the plugin icon it shows me the option to select the database and afterwards it doesn't work at all.

Using the latest version https://download.giswater.org/plugin/3.5/giswater.xml you are always in a continuous loop of capturing your username and password for the database connection

OS: Ubuntu 20.04
QGIS Version: LTR
QGIS Profile - Clean profile with only giswater installed
PostgreSQLDB: kartoza/postgis:11.0-2.5