Apple

What in the world is going on? Ever since the most recent software update, my phone keeps randomly switching from my network to some other found networks. i have no idea where they are even coming from. I then select "forget network" on them or I disable auto connect on them and I changed another setting to ASK before joining. And yet then literally a few minutes later I get a message saying it found some xfinity network again and it gives me no option to accept or decline it and then switches from my network over to that one yet again!