I have 4 Decos that make up my home network. I've had these set up for the last couple of years with no problems. I have 2, X90's, one of which is the main router that has been plugged in with the same CAT 5 cable since I set it up. 

The other 3 units, 1 X90 and 2 X68's, are being used as satellite units in a wireless mode. Again, no problems and no change in physical locations. 

For the last week or so, I am getting the following message on the X90 that is used as the router (plugged in from the ISP modem).

"Abnormal WAN port Speed. Please check your WAN port connection"

Nothing has changed. CAT is plugged in. No issues. 

I also get on the satellite X68;

"Ethernet backhaul speed is low. Please check your ethernet cable connection"

There is no physical cable connected to this unit. The app shows a very weak signal (again, nothing has physically moved and I always had a very strong signal on this unit). 

So, I have tried rebooting the entire system. I have unplugged the ISP cable into the main X90. I seem to be losing my ISP connection several times a day. I have to reboot the ISP modem. 

Any ideas as to what has changed and why I am now getting these messages even though I have had no change in my physical setup of this mesh system? 

Thank you.