I have a 2015 Macbook pro, which I bought about 3 months ago.
Some days ago, when I was using it, and connected it to my house's wifi network, everyone's internet connection suddenly dropped (as in they couldn't load anything, but wifi was intact). It didn't just happen in my house, so it makes me think something is wrong with my Mac.
If it helps, it's running Sierra.
I found out that this has happened to other people: http://www.mac-forums.com/internet-networking-and-wireless/183185-macbook-airport-breaks-internet-connection-entire-network.html
But nothing there was helpful.
Does anyone know how to fix this?
IMPORTANT EDIT: I believe I've found the cause of the problem: I'm using the program Parallels to run ubuntu, ** and if the program is not on, I can't lose all my internet connection.**
I've uninstalled the program and now I'm on a bigger problem now: I still can't connect to internet and I can't reinstall the program… help pleas
If I were you, I would backup all your important files, reformat the disk and reinstall the macOS unless you would have a better clue of what the problem is. It might be something as simple as a corrupted preferences file or as difficult as a faulty hardware component. If you try this approach and you find out that everything is working as it should then at least you can exclude any hardware problem.