I have had my Nest Wifi for a few months and have loved them thus far. They have been consistent and speedy. In the past week, I am having an issue. I am a pastor, and I upload a video every day. The video is max 350 MB. For the past week, any time I upload the video to Youtube, my entire connection becomes unusable for anything else. I can't use my browser because I get constant DNS errors. My kids can't stream on Roku. My son can't use his computer. This has never been an issue until this week. Up until this week, my daughter could watch Roku, my son could watch Youtube, and I could continue doing other work online while the upload occurred. Not anymore.
I thought maybe it was my ISP because I have had issues there before, but they find no issues in the line. So, I decided to isolate the issue, I turned off Wifi and plugged my computer directly into the router (Not the Nest) while the upload happened, and the internet worked like normal. So, I know this is an issue with the Nest Wifi system itself. Any ideas on what I can do to fix this issue? I can't afford to go with another system since I am still paying on this one!
This feels like a "bufferbloat" issue. I just ran a quick test on my own system here, and it seems to be working pretty well in terms of mitigating that issue, though I don't have a double-router setup like it sounds you have. Can you try running this test: https://www.waveform.com/tools/bufferbloat to get a feel for how your system is handling this kind of load?