So I recently got this installed. I am new to this and don't really know much. I'm with Bell internet in Canada if that helps
The service is in the basement and the router is upstairs. The connection is good, showing 4 out of 5 bars. My cellphone and laptop wifi is good as well. However some channels have unbearable lag. Most notably, AMC, ESPN, UFC PPV, movie channels etc. When I try to stream shows it also lags and sometimes it'll just stop but I can hear audio.
I was thinking of using a wired connection or getting a range extender.
You can start by stating the service you are using, the actual device in question, and the internet speed it's getting while doing a test directly on it (what is going on with your cell phone and laptop doesn't matter in the overall equation btw).
Although ditching wifi altogether, even if it means having to run a long ass ethernet cord, tends to top my default list of initial suggestions.