Same happened to me during all weekend
Fire tv original works good but the 4k stops and buffers every minute
Its sad the 4k works so bad compare to previous models
Before was working good but something happened again!!
I have bothe the 4k and the fire tv basic and this one works awesome much better fot iptv than the 4k, no crashes and with last formware update no pixel salad
same issues. It is not possible to use smart iptv or any other, after few minutos need to reestart. Image freezes, or black screen buffering ....
It is sad I have the fire stick basicedition and works great¡¡ i bought the 4k to improve and the result is I have to keep using the old one
I hope...