It's probably the powerline adapter, it sees it but it wouldn't get an IP. It's fine for now, the lease will still renew while DHCP is enabled but hopefully it won't cause you to disconnect anymore
As the physical setup has changed the same settings for QoS may not work as well so you'll just need to fine tune it more - don't rely on auto setup just adjust it manually - we usually suggest starting at 70% then adjust by 10% up or down (it doesn't always have to be lower) until you get to a value that's pretty good then try 5% either side of that value to see if it can be improved further. Download & Upload also don't need to be on the same percentage, you may have different percentages where they each give the best results.
It is important you have set the speeds you pay for/expect into the router though so it's using that as the basis, otherwise if you've left it with the speeds the in built speed test came back with for example then you may have them set too low and then you're then making it even lower than needed with the percentages.
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