@David-TP 

Thanks for the reply. After Googling what a local DNS server is , no I don’t have one, or a filter. Virgin hub is in modem mode and Deco S7s are as they came out the box, except for the settings to get them connected. Nothing else on the Network except the usual clients.

Some differences compared to the link you posted is that the web browser login to the Deco and the Android App both say everything is working normally, no faults. And I have the LEDs set to off but they are on and red (same again this morning). Something is happening overnight.

Edit: I’ve just noticed something odd with the LAN IP Addresses, I’ll update later.

Update: Years ago I used to have two wifi networks, 192.168.0.1 and 192.168.1.1. Nowadays I only have one but I kept the 192.168.1.1 as the LAN IP. I notice that the Main Deco unit is 192.168.1.1 (which I set) but the satellites have taken 192.168.0.n as their IPs. Possibly this is the issue. I have set IP to 192.168.0.1 to test.

  @Tim_7 This seems to have fixed the problem . I’d be interested to know why the satellites don’t take the same IP address range as the main unit though?

  @David-TP 

Thanks. The LAN subnet mask is 255.255.252.0 which I think was the default. Would 255.255.255.0 be better (more robust)?

On the subject of LEDs mine is very much like the second of the two links. I do have a schedule set AND the LEDs set to be Off. The LEDs follow the schedule even though the LED Off setting should override this.