Why does my Xbox disconnect from the wifi whenever I turn it off

Hi, I hope you're doing great out there. I am an Independent advisor and I am here to help you in regard to your concern.

I have here steps that we can try, please perform an extended powercycle and reset your network hardware by following the steps below:

1. Unplug the power cable from the back of the router, modem, or gateway for 5 minutes. If you have a router and a modem, unplug the power cable from both devices.

2. Press and hold the Xbox button on your console for 10 seconds or until it turns off then wait for 2 minutes before turning it on again.

3. After 5 minutes, plug the modem or gateway in first, and wait for all the lights to return to their normal state.

4. If you are using a router, plug in the router and wait for all the lights to return to their normal state. ​​​

If that didn't work resetting the console keeping games and apps will be the next option. Don't worry because as long as you're connected to Xbox Live your saved progress, games, will not be deleted. It will remove all of your accounts but you can add all of them later on.

Press the Xbox button to open the guide.

Select Profile & system > Settings > System > Console info.

Select Reset console.

Reset and keep my games & apps.

I fixed the Xbox disconnecting from WiFi after turning off thing

my xbox disconnects, but I think because of the mobile phones and wifi, but I turn my phone wifi off and it works fine, it it's not completed then I just click download again and it starts from there it finished.

Turning off your WiFi access point / router should help. Then your xbox is also disconnected from xbox live.

I disconnected my computer from the internet and then plugged my phone into the computer and left the wifi on the phone on. this didn't work. ALTHOUGH, when I turned off my wifi and left my mobile data on the xbox app worked perfectly. I assume this means the issue is my internet.