is your stick using wifi ? usualy they jump on 2.4ghz,make sure its on the 5gh ( make sure your router aint using the same wifi user / pas for both 2.4 and 5 ghz ) ,,same with 4k buffering .it's a lo of data to be transfering over wifi. i recommend getting a amazon ethernet adaptor and hard wire it , youl get 1 @ .. if not look for same thing
https://www.amazon.com/Amazon-Ethernet-Adapter-Fire-Devices/dp/B074TC662N if not your iptv is **** , i stopped using iptv after getting free codes to put in downloader for apps , mabe ask people for free codes, to fek with paying for stuff thats free .. im sure someone will have ..ps .i never went back to iptv , and thats been 2 years