@Kevin_Z Update: I have reinstalled the C4000 and assigned static internal IP addresses to each of the devices connected using IP & MAC binding. So far the C4000 has been stable (no more disconnects)...

@Kevin_Z Hello Kevin: So, yes, the C4000 is attached to a Technicolor Model TC4350 cable modem via the WAN port. And yes, I use a switch (a D-Link DGS-108 8-port gigabit switch) to feed other...

@Kevin_Z Hello Kevin, appreciate your response. In my case all 4 LAN ports on the router are in use. Port #1 feeds a switch that feeds my Mac and on occasion a Raspberry Pi or other single board...

@desi76 I can confirm this exact same thing! Bought the AC4000 1 week ago and it was fine for the first few days, but now continues to drop ALL Ethernet connections. Only way to restore Ethernet...