My new Series X keeps randomly disconnecting from xbox services for a couple seconds.

Hi, my name is Marvina and I will be happy to help you.

I'm sorry you have this problem. Follow the instructions below for a solution.

when a game crashes, closes unexpectedly, or has trouble launching. To begin troubleshooting any of these issues, first check to see if there are any known issues that may be affecting your game.
Sometimes a game crashing or starting issue can be caused by a temporary issue that may be fixed by simply exiting the game and restarting it. If the game is running, try exiting the home screen. This is the way:

Press the Xbox  button on your controller to open the guide.
Note Some crashes may prevent you from exiting the game. If you can't return to the home screen, skip to Step 3: Power cycle your console.
Select the game, press the Menu button  on your controller, and select Exit.
Try restarting the game.
If this step didn't work, continue with the next step.

Try turning your Xbox console off and on. Turning it off and on completely resets the console. This does not mean that the games or the data they contain are deleted.
Turn off the console by pressing the Xbox Button  on the front of the console for at least 10 seconds.
Turn the console back on by pressing the Xbox Button  on the console or the Xbox Button  on the controller.

Note If you don't see the green startup animation when you restart your console, repeat these steps. Press and hold the power button for at least 10 seconds until the console turns off completely.

Once you have completed the steps above to turn your console off and on, try restarting the game.
If this step didn't work, continue with the next step.
Sometimes the game may be affected because the profile data is corrupted on your Xbox console. To check if this is the case for you, try playing the same game with a different profile on your console.

Press the Xbox  button to open the guide.
Select Profile & system, and then select Add or change.
Select a different profile than the one you were using previously.

If you don't have another profile set up on your Xbox, you can create a new profile just for testing, or you can ask a friend to upload their profile to your console to test the game for you. For help adding another profile to your Xbox console, see:

Sign in to Xbox
Now restart the game to see if it works correctly with another profile.
If you can play the title with another profile, go to step 6: Remove and re-add your profile.
If you cannot play the title with another profile, go to one of the following pages:
Fix problems playing disc games on Xbox
Troubleshoot digital games on Xbox

If the Xbox console profile is causing the gaming issue, the game profile data may be corrupted. You can correct this problem by removing this profile from the console and downloading it again. To remove your profile:
Press the Xbox  button to open the guide.
Select Profile & system > Settings > Account > Remove accounts.

Select the account you want to remove (the one with the game problem), then select Remove.
Now, download the profile again to create a new version of your profile data:

Press the Xbox  button to open the guide.
Select Profile & System, choose Add or Change, and then select Add New.
Enter the email address and password you use to access your Microsoft account (the same account you just removed).

Important Make sure you don't select Get a new account unless you really want to. If you select Get a new account, a completely new Microsoft account will be created.
Follow the prompts as the console guides you through account setup steps, such as privacy information, sign-in, and color preferences, until you return to the Home screen.

Once you've completed the process of recreating your profile on your Xbox console and returned to the home screen, try playing the title again.
If this step did not solve the problem, continue with the next step.

Information source (credits):
https://support.xbox.com/es-CL/help/games-apps/troubleshooting/game-issues-resolution

I hope I can help you solve it.

Best regards,
Marvina.

I have the same exact problem - just started randomly happening about 3 months ago. Randomly when I power my Series X off it will disconnect from the known router address and I have to keep setting up a network over and over upon launching it the next time. Then it will be fine for a few weeks and out of the blue rinse and repeat.

Check the forum or just google "XBOX Series X disconnects from wifi". Tons of threads here and on reddit since the launch.

An example.

Thanks, that seems to have also helped my second problem of randomly disconnecting from Xbox live.

At the back of your router there's a tiny hole you can press using a ball pen for 5 sec to factory reset it. Please note that after a factory reset, you will have to connect to your network using the default Wi-Fi SSID or name and Wi-Fi password indicated at the back of your router or manual.

Yes, Wi-Fi has to deal with software but it's a hardware just like bluetooth. A device won't be able to support Wi-Fi if there's no hardware for Wi-Fi or wireless connectivity or let's simply put it as a wireless card.