Buffering when streaming is a common problem that can be caused by ISP throttling, which slows down your internet speed. One way to avoid buffering is by using a VPN that can bypass content-specific buffering and throttling
Additionally, you can try reducing anything that consumes bandwidth, such as closing unwanted applications and programs, pausing streaming for a few minutes, or decreasing video quality.
Checking your internet speed using Speedtest can also help identify if your ISP is making good on its promise . Removing other devices connected to the network can also help improve the internet speed.