Slow to tune in

I've recently been having issues with it taking time to "tune in" to channels. I pick something from the guide, or type in a station, and it doesn't just change, it just puts up a blank screen. It's always been slow with the music choice channels, but now it's getting like that with a lot of channels. My internet is also cutting out a lot lately, and I have restarted it, and it comes back that there's no problem.