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Okay. So, I don't know exactly what you're doing to test that, but I'm going to assume, say, trying to go somewhere in a Web browser.
First off, I have occasionally seen problems myself where consumer broadband routers that have been on for a long time wind up briefly becoming unresponsive. Probably some sort of memory leak or something. So if you haven't rebooted the thing and seen whether all your problems magically stop showing up, I'd probably try that. Quick and easy.
Okay. Say that doesn't do it.
When you confirm that the router can reach the Internet during this period of outage, how are you doing that? Going to a management Web UI from a wired-LAN device and trying to ping some host on the Internet?
it's a gl.inet brume2 running openwrt, I SSH into it and can ping outwards to anything and my speed test from the CLI tells me i have 900Mbit available
Ah, gotcha, cool. If it's OpenWrt and you have shell access, that should make it easier to diagnose. When you are checking that you don't have connectivity from your local LAN device, you tried pinging the same out-there-on-the-Internet host, and that failed?
Yes I use the same destination fro testing on my laptop and the router.
I think I've narrowed it down to a DNS issue, I just don't know exactly what. I can ping outwards from my laptop when using IPs but not names. But my laptop can reach my DNS.
For whatever reason ISPs tend (at least in here) to be pretty bad at keeping their DNS services up and running and that could cause issues you're having. Easy test is to switch your laptop DNS servers to cloudflare (1.1.1.1, 1.0.0.1) or opendns (208.67.222.222, 208.67.220.220) and see if the problem goes away. Or even faster by doing single queries from terminal, like 'dig a google.com @1.1.1.1'.
If that helps you can change your router WAN DNS server to something than what operator offers you via DHCP. I personally use opendns servers, but cloudflare or google (8.8.8.8, 8.8.4.4) are common pretty decent choices too.