I am a student and need video lectures to prepare my studies. In this regard I regularly download video lectures from YouTube. From some days when I download videos, after sometime the downloading breaks and showing an unknown error. I am using https://dlvideotiktok.com to download videos.

I have contacted internet provider but no issue font at their end. I have tried from my side but still issue exist. 

Is it possible the issue with the Wi-Fi router???

Please guide.

Thanks