Only entry for this is from my daily 0300 reboot (TP-Link vulnerability mitigation) and recovered within 2 minutes.
So I just checked PiHole's console and am still only seeing the IPs. Was so concerned with the power issue I didn't dive back into the forwarding.
From the Windows box I have verified that pi-hole is the DNS server but I'm getting a non-existent domain when checking the IP. I'm guessing maybe the Deco system isn't exposing that information - the router does display hostnames on its system.
Yup, looks like this is probably the issue. Deco doesn't support it.
It helps to better understand if you could post the command and output here for us to inspect?
Our postings crossed.
Thats a bummer!
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Overall I haven't been too impressed with Deco minus the coverage - there is no web GUI for management (you use an app) and it has taken Apple's approach with "it just works".
Longer term plan is a Ubiquiti solution (cameras + doorbell + APs + PoE switch + etc) but that's down the road 
If you're able to disable the DHCP service on the Deco, you could try let Pi-hole take over that part:
Sadly not an available option unless I run a different router and do Deco units in AP mode only. One of those things I wish I had known before getting all the Deco units, haha.
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Quick update now that we are 7 days from the original posting.
Fully suspect the issue was power related and resolved with the adding of the UPS.
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