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WIth out using the extender, does the 880L work on it's own? I presume also that you maybe hitting a limitation with having all these devices online along with the extender. Also:http://www.androidpolice.com/2018/01/12/google-home-max-appears-killing-wifi-networks/Keep us posted.
With most extenders, clients connected to the extender get about half the bandwidth of what is available from the extender to the router. Remember with wireless bandwidth is shared. The more clients connected, the less they get.
How many devices are all connected. Most home routers only support maybe up to 20-25 devices depending what they are doing. Theres bandwidth and connection per device that are more than just one connection. I can also test an extender here if needed. Can you disable your extender and just run the router alone?
I would presume that if you added the extender, maybe the issue here. You might try a different extender and test. Location of extender is important as well.I can add a NG extender I have to the 880L and see if anything happens.
How far away is the extender placement? In feet.
What version of FW is currently loaded on the DAP? And what is the most farthest distance your trying to connect to the 880L router when not using the DAP?
I'll set up one of my extenders and see if anything happens. Would also consider maybe how many connections are on the DAP as well could be a factor. Also the connection rates differ from the 880L. I know the 880L does (600Mbps on 2.4Ghz + 1300Mbps on 5GHz)Where the DAP only does up to 300Mbps (2.4GHz) + 867 Mbps (5GHz).I've always found it best if using a extender to try to match the same connection rates that are seen on the router. So in some ways, the 1620 will be a bottle neck since it doesn't match the same rates on the 880L.