Once when I was having some reception problems the cable tech (Charter) noticed that I had added several splitters to accommodate some added devices. He pulled them all out and added an 8 channel 0 db (no gain) distribution splitter. So now whatever signal level comes in is what each device gets, with 0 dog biscuits gain above the feeder. With that and the trimming of all excess cable lengths, the inside of my customer access box look very neat and the door shuts easily.
BTW, You need to be sure you have splitters rated for forward and backward data flow since many of the older splitters aren't up to that standard.
Paula, As for your current problem on certain parts of your system, I think you will find it's as Mongo has stated, due to a faulty connection or possibly a partial short circuit on one of the cables. Even a corroded connector or a high resistance short can perform as a diode and radiate hellish levels of RFI.
I by-passed the router and hooked L's desktop directly to the modem. She watched Netflix for several hours without a single hiccup in audio or video. She had been watching it with the wireless and it started skipping. Not as bad, but it was there. My desktop which is still hardwired to the router, is almost impossible to view anything such as video, audio, or viewing large images (like NASA image of the day) or "busy" pages.
I'll make a call to the cable company and have them clean out the box. It needs to be done anyway. I'll see if they'll also take care of the outlet here in the office, even though they didn't install it. I may still get a new router but I'll hold off for now.
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Sound good. And that reminds me that my provider, Charter Cable, is offering a modem upgrade for free if I'll do the install. Supposedly the new modem is faster. I currently get 90 Megabits down and 10 up so I may just leave well enough alone. I've been guilty of fixing things until they're broke before.
Good luck with your tech visit. Tell him you're getting intermodulation distortion and spurious RFI radiation and see if his eyes cross.