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New Don't you have the splitter in reverse?
AFAIK, a splitter serves to distribute one input device across multiple displays.

Speculation:
When the TV is turned back on, it renegotiates the HDMI connection with whatever is connected. I think what you're seeing is that the cable box responds the fastest out of all the devices you have chattering on the splitter and therefore it "wins" the connection to the TV.
New Splitter was the wrong term. It's an HDMI Switch.
https://smile.amazon.com/dp/B0049S6ZUS/

3 inputs, one output (to the TV).

I think the cable box times out after some period of time while the Chromecast is always chattering so it wins the connection. Maybe. It's not been enough of an annoyance for me to even read the instructions to the switch box. ;-)

Cheers,
Scott.
New No external switches here
HDMI from the cable box, RCA stereo & video from the Wii, RGB+stereo from the DVD. DVD and Wii are turned off and it still keeps re-detecting video mode from the cable box.
--

Drew
New Does it behave the same even if you unplug the other devices?
New Need someone to help with that
The way it's mounted to the wall, I can't reach the plugs. Been trying everything else first.
--

Drew
New It sounds like a hardware fault.
Some chip somewhere is now seeing or reporting something it shouldn't be.

Wade.
     TV keeps auto detecting video mode - (drook) - (10)
         Is there anything plugged in to that port? - (static) - (9)
             It's got multiple inputs, but that's not what it's doing (I think) - (drook) - (8)
                 Is it new behavior? - (Another Scott) - (7)
                     Not smart, so no firmware - (drook)
                     Don't you have the splitter in reverse? - (scoenye) - (5)
                         Splitter was the wrong term. It's an HDMI Switch. - (Another Scott) - (4)
                             No external switches here - (drook) - (3)
                                 Does it behave the same even if you unplug the other devices? -NT - (crazy) - (1)
                                     Need someone to help with that - (drook)
                                 It sounds like a hardware fault. - (static)

You have no concept of an internal monologue, do you?
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