I have a ZyXel VMG4825-B10A connected that drops out daily..........Lights stay GREEN and in Dashboard it says connected. It is connected to a Ubiquiti Enterprise system with 5 APs. They all work well and rarely have any issues.
When the connection drops , WiFi signal in not affected. If I toggle ZyXel radio (WiFi) , it makes no difference. The only way to correct the issue is a power cycle, and then it comes right back