Modem loud

My modem was loud about a month ago and I almost swapped it. Before I got around to doing that I unplugged it, my tv box, and my printer and then plugged back in. The noise stopped, but I just recently discovered that I no longer could print wirelessly from my phone. I went through my hip smart app to get the printer back online; now the printer works, but the humming noise is back again now. I’ve called Comcast; most of the time you get a low level person who just will tell you to swap it. Once I did get a person who seemed to know a little more and he said that it happens if there is a slower operating device on the network. This may be the case with my printer, I’m not sure. I don’t know if there is s fix other than taking that device off the network. I guess I’ll just live with the noise. Good thing about being old, it doesn’t bother me that much.