u/TrantaLocked

I saw this message on the app: "we changed the order of some lessons. You'll keep learning from the same spot!"

Now I don't recognize any of the words in current lessons, they're too hard now, and if I scroll to previous units in section 4, most of the material that looks like I've "completed", I don't recognize. So it seems like I won't have a chance to actually learn that material.

Can a Duolingo support representative please help me revert this change?

I have a Linksys EA9300, which is WiFI 5 / AC Wave 2. I'm trying to find out if the media loading issues I have primarily on reddit and ebay are due to the router itself. Apparently, routers made before HTTP/3 can have issues handling UDP bursts used by HTTP/3, and reddit heavily uses HTTP/3. You can actually disable HTTP/3 in your browser, it's called QUIC in Chromium, and http3.enable in Firefox.

Does anyone else have issues with their Linksys AC router and reddit, maybe other websites?

I've been deep into troubleshooting problem I've had for about a year that only seems to affect reddit hosted media and ebay search. Typically, reddit hosted images and video will load for a bit, then not load at other times. It seems to alternate between loading and not loading every couple minutes. On ebay, searches results almost always failed to load images past the halfway point.

After looking into DNS, Spectrum ISP stuff, talking to AI, looking into threads with similar issues, I tried changing to Cloudflare on my router. This seemed to stabilize reddit for a while, but the same issue eventually came back. So I figured, it's either Reddit throttling me or something is wrong with Spectrum's internal network.

Then I came upon a comment suggesting to disable HTTP/3 in the browser.

https://www.reddit.com/r/firefox/comments/1tseou6/comment/osk8m09/?context=3

This sent me down another rabbit hole of trying to figure out what HTTP/3 is. But the gist is that it's a newer, efficient protocol for sending packets using UDP instead the the typical TCP. 

Apparently, large amounts of encrypted, header-less UDP packets, common over HTTP/3, can trip up routing equipment not designed for optimal HTTP/3 handling. Possibly even causing a short delay where that UDP connection is blocked for a minute or more, because the equipment literally thinks the data is a DDoS attack.

Now, my ISP is Spectrum, in California. I do use my own router, a Linksys EA9300 AC Wave 2, which came out before HTTP/3 was finalized as far as I'm aware. I did use T-Mobile Home Internet for a while with its own Wi-Fi 7 router. I never had media loading issues on TMHI. But TMHI has a ton of other issues that made it hard to use so I switched back to Spectrum.

Now I've disabled HTTP/3 in Firefox, and am just waiting until I run into the media loading issue again. I haven't yet but it will take a couple days to be sure.

So now I'm curious, could the issue really be HTTP/3? With Spectrum's network, CDNs (switching to Cloudflare DNS helped a few hours, that seems like I was possibly getting a better route or CDN for a while), or my Linksys AC Wave 2 router? How can I test this? If this is the issue, are Spectrum and/or Reddit aware? Or is it some other issue? Is Linksys AC Wave 2 known for aggressively throttling UDP traffic it isn't programmed to handle?

Media will load when I first open reddit.com for a few minutes. Then it will stop loading for a few minutes. This cycle repeats forever and has been going on for over a year.

When we temporarily switched ISPs to T-Mobile, this issue didn't happen. It has only happened on Spectrum. It happens on every device I use.