Right now, as a customer, the only thing you should "insist" is that it should be working correctly.
No I have not tried putting back the old splitter mostly because I am worried about screwing up anything more, but late last night the WH screwed up again (watching in BR a show on Living room DVR). Also at some point the kitchen receiver had its SAT 2 issue again and screwed up a test recording.
Should I insist on the splitter being replaced?
"From the tech's point of view":
Customer says do this because some bozo on the internet says it might be the problem.
It's not going to be received too well, and frankly it wouldn't be by me either.
A way to get around this is to do some testing and get some results that suggest/point to where the problem might be.
The CCK is out of the loop, so the router has nothing to do with the problems.
WH is flaky and one receiver is having problems with tuner #2.
A step to try is to swap the kitchen and bedroom receivers.
See what happens.
Does the tuner #2 problem stay in the kitchen, or does it move to the bedroom with the receiver? Or does it not happen?
If it stays in the kitchen, then the cabling and splitter are where the problem is.
If it moves with the receiver, as much as you don't like it, it looks to be the receiver causing it. If this is the case, "maybe" it's causing the WH issues, and pulling the power cord on it might show the other receivers are working fine.
Hard failures, by their nature, are easier to fix than problems that take a day or two to happen.
The more you can do to isolate the problem(s), the easier it will be to fix.