Why does high-speed fiber internet still face random disconnections?

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Hey everyone,

I’ve been noticing that even with fiber connections, many users still experience random disconnections or unstable speeds, especially during peak hours.

I’m curious to understand what usually causes this:

Is it mostly due to ISP infrastructure limitations?
Router or hardware compatibility issues?
Network congestion or bandwidth distribution?

In theory, fiber should provide stable and consistent performance, but in reality, many people still face interruptions in streaming, gaming, or work calls.

From what I’ve seen, stability matters just as much as speed, which is why many users today look for the best internet provider that can deliver both reliability and performance.

Would love to hear your thoughts or experiences on this — what’s been the main issue in your case?