I'm with T-Mobile, but I am still experiencing major Wi-Fi issues.
What is happening for me, is that, I connect to any network. Then 10 seconds later the network completely disconnects. Then approximately 10-20 seconds later it reconnects again. It keeps doing it over and over and over, non stop, in a cycle. So I completely disconnected from my Wi-Fi, and I'm using my 4G LTE full time for now(until we get a fix for the Wi-Fi). I started noticing this on my home network, but then as I go to other Wi-Fi networks, the same issue occurs. I tried it on my home private network(where I first noticed this), my work private network, the mall public Wi-Fi, and two of my friends houses private network. But the same exact problem still arises.
I'm already on my third device, because the first device had some bugs including the Wi-FI issue. I was told by my carriers customer care to do a buyer remorse exchange, at the direct carrier store where I purchased the device. So I did that on the same day the phone was released. Then unfortunately, the next day, my dog cracked the screen, and even broke the front camera. My dog even broke an OtterBox Defender case, and completely ripped off the side bumpers of the case. So I had to do an insurance claim. So I'm on my third device, and all three devices that I've had. Have had the Wi-Fi issue.
I even did a factory reset to the third device(the one I have now), because of the Wi-Fi issue, and a home button vibration issue. Where the vibration would not stop, even in standby mode. It was also causing the Android OS settings to even be disabled, by not let me go into the OS serttings. From the Android OS taskbar menu button, or the button for the OS settings in the app drawer. The factory reset did fix the vibration issue, but it didn't fix the Wi-Fi issue at all.
I also contacted Samsung, and they're not helping me at all(including managers). Samsung is not even giving me any answer, if this is a known problem or not. Not a yes, no, maybe, I don't know, possibly. Every time I call, they always try to make me send it in so they can investigate the situation, and keep the phone for God knows how long(sarcastically speaking). Or they try to sell me something instead.