DIAGNOSIS Unstable 2.4GHz Wi-Fi network connectivity. The S8 Pro Ultra does not support 5GHz bands. Common causes are router settings, signal strength, or IP address conflicts.
FIX Reboot your router and the robot. On your router, ensure the 2.4GHz network uses a simple encryption like WPA2-PSK (AES). Disable 'Smart Connect' or similar features that band-steer devices. In the Roborock app, forget the robot and re-add it to the network, ensuring you select the 2.4GHz SSID.
IF THAT DIDN'T WORK The issue may be signal strength at the dock location. Use a Wi-Fi analyzer app to check signal strength. If weak, consider a Wi-Fi extender. Alternatively, assign a static IP address to the robot within your router's DHCP settings to prevent address renewal conflicts.
HEADS UP The robot will not connect if your network uses a captive portal (like some hotels or apartments) or has MAC address filtering enabled. The dock must be within stable range of your router for reliable remote control and scheduling.