My setup has been working without a wi-fi drop for more than a month now.
I don’t think the config setting to prevent power-save mode is what did the trick but rather a post I found here in the forum about forcing the dongle/wi-fi to reconnect when it drops.
If you try and search for that or alternatively for posts I had commented on, you should find it.
I did not post back about my success as I wanted to give it ample time te see if it might drop the connection again.