buffering

I am getting buffering on both my 4k firesticks as part of multiroom setup. My service provider blames the ISP and I have done all the normal things like reboot the router/ firestick etc. I use other devices (laptops , phones) which don't seem to have a problem with the network and would like...

Does anybody have an optimum buffer size for a Mag256 that seems to have buffering issues or is it just trial and error to get the best buffer size?

thought id check out this iptv so got a months sub from my prresent cable supplie..anyway im not that impressed by the qaulity..it seems like that they are streams and not genuine full HD broadcasts. For example sly sports HD are not very smooth when watching football or cricket. It seems like...