Loss of signal when tv turned on

I'm completely baffled by what is happening with the wifi signal in my house. We have a long, one story house with the main airport extreme router (connected to a surfboard modem - Charter high speed cable internet) located at pretty much at the far end end of the house in the office (there's one more bedroom before the house ends).
I have an airport express about 40 ft away extending the signal to the other side of the house.
There is one computer hard wired into the extreme in the office.
Everything was working perfectly until a few months ago when we started to loose the signal, mostly in the late evening. This isn't an internet issue because the hard wired computer is just fine during these times.
We finally realized it corresponds with when our flat screen tv is turned on in the bedroom across the hall from the office. The wifi is perfectly fine if you are standing within the office or surrounding bedrooms, but as soon as you walk down the hall 5 ft, there is only a very, very weak signal and the express can't extend anything.
I've tried changing channels, moving around the location of the extreme, and nothing works. The tv is not connected to the internet and there are no components attached to it. iStumbler finds nothing when the tv is on and Charter says there's something wrong with the extreme, not with their wiring or signal and not with the tv.
The weird thing, is that this was not a problem until a few months ago. Before that, the tv and internet were working perfectly fine together...it pretty much started having problems over night.
Does anyone have any suggestions? It's very frustrating and I'm out of ideas.

Everything was wired by Charter and they've come out 3 times to check the lines. There is a splitter where the line enters the house and it is split and all are connected by cables for each of the bedrooms and living room (4 rooms/TVs total) for cable tv and then one for internet in the office.
I initially thought there was something with the line when the cable tv is running (and it's definitely the cable box that is the issue, not the tv as I've tested this with the tv running and the cable box seperately and it only drops when the cable box is running), however, speedtest on the desktop wired into the airport extreme are consistent whether the tv is on or not. It only affects the wifi.

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Loss of signal when tv turned on

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