Hi  @Tescophil 

Here are some troubleshooting steps to resolve the issue:

Possible Causes & Fixes:
 

1. Network Connectivity   
   - Check Network Stability: Ensure the connection between the ER605 and the controller (wired or wireless) is stable.  
   - Disable STP (Spanning Tree Protocol): If enabled, STP can sometimes cause intermittent disconnections.  
   - Static IP for Controller: Assign a static IP to the device hosting the Omada Controller to prevent DHCP lease issues.

2. Controller Hosting Problems 
   - Check Host System Stability: If running on a PC/NAS, ensure the system isn’t going to sleep or experiencing resource bottlenecks.  
   - **Try a Different Host**: Test with the controller on another device (e.g., a Raspberry Pi, Docker, or a dedicated server).

3. Database Corruption 
   - Backup & Reset Controller: Sometimes, the controller database gets corrupted. Try:  
     - Backup settings → Reset the controller → Restore from backup.  
     - If the issue persists, set up from scratch without restoring.

4. Hardware/Port Issues  
   - Check Ethernet Cable/Port: A faulty cable or port can cause intermittent drops.  
   - Power Cycle: Restart both the ER605 and the controller host.