I've tried a few services where I was expecting more 720P/60FPS sports channels. On the one service, it started that way and now they are all 702i/30FPS which doesn't work at all for sports.
Can FPS be impacted by the box, app, etc?
I'm trying to find a new main service that has 720P/60FPS sports channels. I keep reading that almost all do, but so far I'm not finding that.
Most services these days are offering the main sports channels from the US and UK in at least 720/50 or 60 (depending on region). Some others, like the Canadian TSN/Sportsnet channels, aren't available in anything above 30 fps as the sources just don't exist anymore. Really depends on what you are trying to watch.
As for whether you can do anything to increase it natively...nope. Aside from the smoothing that some TVs, etc, can do (which usually looks terrible), there isn't anything you can do to actually increase the frame rate from your end.