Internet keeps coming and going

For the last several days the internet seems to stutter for lack of a better description.  It happens on my computer, on my phone and when we are streaming on our tv.  Sometimes it just freezes, sometimes the sound goes and the picture stays, sometimes I am completely disconnected.  This is particularly irritating when I have something that I need to launch, like an eBay listing and it vanishes.  On my phone, I'm at the point of turning off the connection to my home internet because the 4 G signal I get from the old phone I have works better than my internet.  Is there a reason for this and more importantly, is there a fix!!! This is beginning to get really old.