Hi @Lothaer ,
Thanks for raising this to us, I would love to help and get to the bottom of this. Please confirm if the devices used to watch YouTube, Disney+ and Netflix are connected via Wi-Fi.
If so, we did an article that you may find helpful this will guide you on how to eliminate wireless interference and to improve the connectin at the same time. Please see the links below.
Let us know how it will go.
For slow speed issues, we've created an article that will help you resolve it.
Do you have a computer that can be connected via Wired to compare the connection speed? Have you tried the troubleshooting given in the articles to improve your home WiFi network?
Are you using the 2.4GHz or 5GHz band network?
Please send me a PM with your TPG username or customer ID number to assist you accordingly.