Another thing I am noticing. WiFi will occasionally shut off on its own after long idle periods, requiring me to manually turn it back on. This is around my house where I have very good wifi coverage. It happens, for example, when I have had my screen locked and the phone in my pocket for a while.
I have also, under settings->network and internet->internet->network preferences, disabled the "wifi turns off automatically" setting.
I have also, under settings->network and internet->internet->network preferences, disabled the "wifi turns off automatically" setting.