Specify connection - Datafow, Gateway on premise

Hi all,

I have a datafow in Power bi service that import a folder (with csv files) from my local machine using the Gateway on-premise standard version. This has been working as a charm until yesterday, where Power Query editor is keeping me asking for 'how to connect', unstopping me from running/editing the query.

I have installed the latest version of the gateway (December).

In my investigation, I have created a new dataflow entity with the windows username & password and it works. I mean, in Power Query I get all the files and run de query normally, and  it creates the data source connection in the gateway configuration.

But, once I save and exit from the Query editor to the workspace and enter again the query editor, I get the message 'Specify how to connect' which it takes me to nowhere, as it does not see the gateway at all and it keeps asking me the same all the time

Any idea o suggestion?

   tew ay