@DeathCold Well, few things wrong. I’ll be listing some things below. Some of it will just be information I’ll need you to provide and other parts will be things I need you to try and report back on. Also, for the future, do consider to make sure you Search Before Posting, but more importantly that you make sure to answer the templates and provide much more detail when Creating Topics.
(side note, I just merged your two topics together and had older post appear on top)
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What version of Windows are you using?
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What Shields settings are you using? (If you want some guidelines on my own suggestions, check out What are the best settings for Shields?)
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Does this issue go away with Shields disabled?
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Does this issue happen in private window?
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Can you add a new profile and test there without changing settings or installing extensions?
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Are you using a VPN or proxy?
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Does this only happen on particular sites?
Yes, it can happen because of one simple extension. Each extension interacts with the browser and websites in different ways. Sometimes their code can create all sorts of issues with browsers. So it’s usually not good to assume they are flawless. Each browser update or change made by the devs of the extensions can result in problems. Meaning an extension that worked perfectly can suddenly cause the browser to crash or lag due to changes made.
This error message is usually a reference for a weak or unstable internet. Though it can mean YouTube’s servers have issues, you’re using an outdated web browser, browser cookies are disabled, or your video driver is outdated. So part of what we’d be looking at are things in each of those areas.
This suggestion makes it seem to be either your Shields settings or one of your extensions. Of the two, based on me not replicating your error message, I’m going to assume it’s poor compatibility with an extension or you have added some content filter. But we’ll just take it a step at a time and find out.