Xbox one controller A button is acting as the home button

Too bad. Have you tried your controllers on a friends console to make sure they are performing correctly? At least you could rule out the controllers as being the issue and then focus completely on the console. As a last resort you may try doing a factory
reset on the console. Maybe someone else has some additional ideas. Good Luck!

Genesis, you DONT have to make sure your controller is fully updated. I have the Xbox 1 Day One Edition console with Kinect. People never had to do Updates for their controllers on Xbox 360. Controller Updates are completely OPTIONAL where as Console Updates
are necessary. I've never updated my controller, and it still functions completely fine in everything.

Are you in the Preview Program thingy? You should be aware of the risks of it. You get unfinished software to test.... before Microsoft finishes it completely and releases it to everyone, not just some special group of people who are impatient and want to
try it out. I've heard reports "it wiped my consoles HDD" etc. I wouldn't want a BETA dashboard version running on my console. The software Microsoft makes on your console is the key thing running it. You don't want a buggy OS. I'm not in the preview thingy.

Try unplugging your console from the wall, then plug it back in again and turn it on. Or it could be a faulty controller. Make sure the controller is also synced with the console too.

My friend is also having the same issue unfortunately

Getting the same issue here it sometimes makes my frame-rate drop to 1 and it is hard to play most games that ask you to sign-in after you press start.

I've held it in to try to turn off the console too and it won't work