Average gamers tend to become frustrated right away if their game crashes, especially if they seem to occur all the time. The good news is, game crashes can happen from time to time, but they are usually fixable. As you can see, there are a lot of possible reasons for game crashes so possible solutions may also vary. 
Below are the solutions that you can try if your Call Of Duty Warzone 2.0 keeps crashing On Xbox One.

1. Force close the game.

   If Call Of Duty Warzone 2.0 crashes infrequently on your Xbox One, the first thing that you want to do is to restart the game. Here’s how it’s done:
   -While Call of Duty Warzone 2.0 is running, press the Xbox button on your controller.
   -Make sure that the biggest application tile is highlighted, and then press the Menu button on the controller.
   -Select Quit.
   Once the game closes, you can reopen it normally and check for the problem.

2. Install updates.

   To lessen the chances of your games crashing, you want to make sure that you keep all games, application, and console software updated.
   To check for software update for your Xbox One:
   -Select the Home button in the center of your controller.
   -Select Settings.
   -Select System.
   -Available updates will be listed under Console info.

3. Restart the console.

   Minor bugs that may result in games not working properly or crashing may be fixed by a simple restart. Try restarting your console using a controller first. 
   If your Xbox One is unresponsive or frozen, you can unplug the power cable from the back to turn it off. Then, wait for at least 10 seconds before turning the console back on again.

4. Clean the game disc.

   If you have the physical game, be sure to check if there’s a scratch, dirt, or crack on the disc. The Xbox One can tolerate certain amounts of scratches so don’t worry if you see light scratches on your Call of Duty Modern Warfare disc now. As long as the scratches appear superficial, and the game load normally, it’s probably fine.
   Cracks on a game disc are different though and must be avoided. They almost always make the disc unreadable. If your game disc has a scratch, this may be the reason for the crashes. 
   Over time, game discs may become dirty from constant touching and dust accumulation. Make sure to wipe the game disc with a clean microfiber cloth before you insert it to the console.
   IMPORTANT: If you think that the game disc may be bad, try playing it on another Xbox One. If the game still crashes in the second console, your game disc is definitely the problem.

5. Check for overheating.

   The Xbox One can suffer from overheating if it’s not getting good ventilation, or if it has hardware damage. The most obvious indicator of an overheating issue is heat on top or on the sides of the console. To prevent overheating, you want to place the console in a cool place and away from direct sources of heat. Be sure that there’s at least 2 inches of space around the console.

6. Refresh the system cache.

   The Xbox One console uses a set of temporary files called cache in order to load games fast. Sometimes, this cache may become outdated or corrupted, which can then result freezing or crashing problems.
   To ensure that the system cache is in top shape, follow these steps:
   -Turn off your Xbox One.
   -Once the indicator lights on the front of the Xbox One and the console's power brick are off, unplug the power brick from the back of your console.
   -Wait at least 30 seconds.
   -Plug the power brick back into your Xbox One and turn it on.

7. Delete saved game data.

   Another possible solution that you can try if Warzone 2.0 keeps crashing is to delete your saved game data. Just like in a system cache, a corrupt saved game data can cause problems.
   Deleting saved game data is permanent so be sure to create a backup of your data ahead of time. You can use a USB storage device to do that.
   The following are the steps to delete game data:
   -From Xbox Home, go to Settings.
   -Go to System and select Storage devices.
   -Select Internal storage on the right-hand side of the screen, then select View contents.
   -Select the Warzone 2.0 game tile and press the Menu button to select Manage game.
   -Select Saved data.
   -From here, you can either delete only the saved data of the profile having an issue with Warzone 2.0, or you can select Delete ALL to delete every saved game of Warzone 2.0. If you select Delete ALL, you’re going to delete the Warzone 2.0 cache as well as the profile saved data.

8. Reset the MAC address.

   Some Call of Duty gamers managed to fix crashing problems by resetting the console’s Media Access Control Address. Here’s how it’s done:
   -Press the Xbox button.
   -Open Settings.
   -Go to Network and select Network settings.
   -Select Advanced settings.
   -Select Alternate MAC Address.
   -Select Clear.
   -Select Restart.