Xbox 360 Slim keeps turning on and off randomly

Heya ChizmoTheFatCat!

Sorry to hear about the power issues with your Xbox 360. To start off, is your Xbox 360 current plugged directly into a wall outlet or do you have a power strip? If you're using a power strip/surge protector, try bypassing that and plug directly into your wall
outlet to see if there's any change.

If you're still having troubles, do you have any friends with an Xbox 360? If so, see if you can test their power supply to see if there's any change with the power issue. Keep us updated with how it goes.

just an amended... the device doesn't have to be in the same room to interferer. IE: cellphone in the kitchen gets a text msg, speakers in the living room make an odd noise.

We only have one 360 in our house and there is only one wireless controller connected to it. I will try removing the battery pack when I get home and see if it happens again. I also have remotes for my TV and receiver nearby, so I can test those too.

Took the battery pack out of the controller last night. It happened again this morning. Someone was using their cell phone while it was happening, but they were outside. Other than that I could not find anything else that might be interfering with it. Could
there be something wrong with the console itself?

I think what he is asking is if there was a wireless controller that was paired to the device that is paired to another console now. Either that or if there is a wireless controller that is paired to the console that might be causing the issue.

Simple way to figure this out, do you have two consoles? If not then A would not be an issue. If so, then it STILL should not be an issue for the same reason a Bluetooth can only be working with one phone at a time. Pairing can only be done with one device
at a time. BUT... I have seen it happen with my sons controller once. He turned on his xbox with the controller and it also turned on MY xbox. We paired the controller with his xbox a second time and the issue was gone. I think it was just a fluke and it started
to look for the original xbox, but then it went to his. It never happened again after the second pairing.

To test theory B, take the battery pack off of the controller (s) and see if it happens again. If it does not happen again, skip to the next paragraph. If it does, you may have another device (a remote control, phone, wireless doorbell, or something else
that is sending out signal) that is interfering with the signal to the xbox. Now you have to see what other wireless devices you have in the area that may be causing the interference. Test each device by using it in front of the xbox and see if anything causes
the issue.

If detaching the battery pack makes the issue go away, then try putting the battery pack back into ONE of the controllers. Wait and see what happens. If the issue returns, take the battery pack out of that controller and repeat the process with each controller
you have making sure only ONE controller has a battery pack in at a time. Should one controller cause the issue but not any of the others, try swapping a different battery pack into the suspect controller. Test again. If it does not happen, it might be the
battery pack. If it does happen again, it may be the controller. If it is the battery pack, just replace it. If it is the controller, you may have corrosion in the controller, a bad circuit, or a closed loop (etc.). In other words, the controller may need
to be rebuilt or it may need a deep cleaning. I will let you decide how to handle that, but I would just buy a new controller.