"This site cannot be reached" - page loads after reloading, most websites

I'm here in Japan and just got GLBB fiber internet in my home. I have a Netgear Nighthawk AC1750 R6700 v3 router plugged into it, using 5G WiFi. When I first hit most websites in Chrome, I immediately get the "This site cannot be reached" error page, also saying "DNS_PROBE_FINISHED_NXDOMAIN". Sometimes Chrome automatically retries and loads the page, sometimes I need to manually reload a few times to actually get the site. Sometimes after reloading I get the page but it's missing a bunch of the CSS, as if I only got part of it, or a few images don't load. Once I do hit the page, I can navigate around that site just fine with no problems. If I pause for a few minutes and come back, I get the same reaction as if visiting the site for the first time, the error page.

I changed the 5G channel from the default (I think it was 149?) to 44 so my Pixel 3 XL could pick up the signal, but it was occurring on the default channel so I don't think that would be the problem, unless there's a better channel to use. I did update the router firmware to the latest after setting things up hoping it would solve the problem as well, version 1.0.4.120_10.0.91

I followed their instructions to configure my router, using the PPPoE to log in to actually get internet access, and set the connection mode to "always on" instead of the default "manually connect". DNS is set to automatic like in the instructions, as well as setting MTU size to 1454.

Tried flushing and renewing the DNS but that didn't seem to have any affect. ~~I haven't tried connecting wired to the router yet since my stuff is still in transit so the router is sitting in a weird location and I don't have a long enough ethernet cable to run to where my laptop usually sits, would be about 3 feet from the router if I had to use wired to have a glitch free connection.~~ I tested with my phone on various websites and it doesn't seem to have the same issue either, using the Chrome browser there. I have another laptop and the same issue occurs as well. Both are Windows 10 with updated Chrome.

Speed tests seem to run fine, did both ookla and fast.com. Low ping (10-40), around 120-160 Mbps down. Somehow have 430-500 Mbps up.

~~edit: moved the table temporarily and hooked up the short ethernet cable i have and did some testing. no connection issues at all. disconnected from wired back to wireless and getting the connection issues again~~

edit again: did further testing, seems to still be happening connected via ethernet. no idea why