Improving Comcast modem signal

"Verizon is now pushing a white cubed wireless 5G device to feed signals to everything with no cables at all."

They've had this for probably two years, although as you say, they've been pushing fixed 5G signals lately.

If you can get Verizon fiber (FIOS), you'll still get faster and more consistent internet than a 5G wireless signal   

Within your house, you'll get a more consistent and faster internet if you used Ethernet instead of WiFi, although it becomes a problem if your house is not already wired for Ethernet.

@chungjh In general, Verizon’s FIOS speeds, latency and packet loss are not affected by what your neighbors are doing on their internet unlike the network at Comcast.

But before you go crazy changing things, keep in mind the design of Ethernet and the internet is that it will tolerate a fair amount of packet loss with only a loss in speed. There’s a ton of error correction built in at the physical and logical layers of the internet protocols, and music, even lossless music, is not taxing your internet connection compared to say, Netflix or Amazon Prime streaming 4K video.