Unstable connection

I have been relatively happy with Brave up to now. Recently, for absolutely no reason, Brave closes the page and my connection is broken. I have been in touch with my ISP and they have checked my connections as well as sending an engineer out.
Everything checked and everything fine. They have suggested it is a Brave issue, their server that is interrupting the connection.
Will you please ensure that we have a stable connection, because I have lost very important work through the interrupting of the connection. This is even happening during the evenings. If Brave cannot provide a stable connection, then I shall delete it.