I was having problems with the controllers and WiFi disconnecting (every 5mins or so), sometimes it would happen to them both at the same time, sometimes just the controllers. I replaced the WiFi card with a replacement (used) unit from eBay. The problem was instantly solved and worked flawlessly for 1 month. However the problem returned out of the blue and was even worse than before! I thought maybe the replacement card had failed. However on a whim I just decided to tear down the entire console and look for loose wires etc. I didn’t find any but I disconnected the wifi card bridge cable (cable between card and main board) and reconnected it then put everything back together again. It’s now been working flawlessly for 1 day so far. I’m not exactly sure what fixed it or if it will remain fixed, I suppose it’s possible during the first replacement something wasn’t securely seated and came loose after 1 month. I also wonder if simply unplugging/replugging the card does something that fixes it for short while?