I was reminded of this thread by your comment Feedback for v1.5 - #229 by irrlicht.
My use of mobile data has been absolutely predictable since making this change, but more importantly so has use of my home and other networks ! It is speculation, but my experience fits with a situation where I expect to connect to WiFi network but mobile data is on; maybe WiFi does not come up instantly, so the connection is made by mobile data. Further speculation, this unpredictability seems to cause the WiFi network to lose interest in the connection … perhaps ?
I wonder if you continued with this setting off and if you consider this change to be any part of the improvement you report ?