Unfortunately, there are several reasons your Firestick or Fire TV might be buffering. On the plus side, they’re all relatively easy to address. Here are a few potential causes worth looking into:
Your internet speeds aren’t fast enough (try lowering the video quality or pausing any other downloads)
The Firestick needs an update (simply get the latest version of the OS from the settings menu)
Your ISP is throttling your speeds (connect to a VPN to prevent this)
The streaming service you’re trying to access is having problems (see if the problem persists on a different streaming platform)
The Fire TV is low on system resources (close any other apps and if possible, optimize your streaming app for low-resource devices)