A predecessor of Comcast first installed the Internet service (pre-phone days) back in 2001. At the time of the installation, an additional splitter was installed. What I will call the first splitter, is a two-way, with one coax running directly to what is now the Internet/Phone gateway and the other coax going into another two-way splitter with those cables from this running to the two TV's.
Now that I have X1 service, is what I have described as the first splitter, still necessary? Some of the Internet channels (on Pluto and Xumo) will occasionally freeze and buffer and I see suggestions about removing extra splitters, etc.