This is an issue for me too. My firestick 4k max seems to vary between 5-40mb, often in the low 20's. According to the connected devices page my TV is currently on 571mb and the firestick is on 5.85mb.
I have :
- Disconnected usb storage and cable from firestick
- Uninstalled anything I could
- Rebooted stick
- Rebooted tv
- Rebooted hub
Don't really know what else I can do.
Any advice or thoughts?
[MOD EDIT: Post split to create own thread]