First, I've never heard of wifi turning itself off. Dropping the connection, certainly, but not physically turning itself off. You won't like me for this but I'm going to suggest going back into Settings and resetting all settings. Something is fooling around with that slider, and it shouldn't be.
Next up, as far as I know, there is no way to automatically connect to a BlueTooth device. I have 3 devices that are paired with a Braven BlueTooth speaker, which I just turned on. None of the devices attempted to connect to it. I presume that this is deliberate behaviour. It would be annoying if, for example, my iPhone insisted on connecting when I wanted my iPad to do it. I would have to turn BT off on two devices in order to connect to the correct one.
By the way, welcome to the forum.
Just to let you know, you could start your own thread if you wanted to. There's no need to hunt down old threads to attach your questions to, and in fact, new threads are often better because so much has changed in the last few years.