Why Does Office 365 Keep Crashing? Expert Solutions

  

Mark Regan
Published: June 19th, 2025 • 6 Min Read

Microsoft Office 365, is the leading cloud productivity suite worldwide. Many organizations use the program daily operations. But, despite the popularity, Office 365 is not immune to issues related to performance. In fact most IT professionals reported that they experience Office 365 keeps crashing. So, if you are in the same situation. We are here to help you by providing proper troubleshooting methods and how to secure your Microsoft data.

In any program frequent system crashes can affect your work a lot. With the Office 365, these issues can cripple your business operations. For example, delay in client’s proposals because your Word doc is frozen or you miss critical meetings because MS Teams or Outlook won’t open. These problems make your business productivity and performance poor

Hence, it is better to solve this problem as soon as you find glitches on your Microsoft 365. But, before that it is necessary to understand the reasons behind this problem. So, here we provided a list of common factors that cause the problem of Office 365 apps suddenly crashing.

Possible Cause of Outlook 365 Stop Working

• Using an older version of Office can lead to you the issue of compatibility and security.
• Poorly coded or corrupt add-ins in your Outlook and other apps can interfere with the key functions and cause you frequent crashes.
• Failing in installing Office apps properly will lead to Microsoft 365 apps not working or freezing.
• Sometimes, corrupt Windows or your Outlook profile can also be the cause of your Office apps behaving erratically.
• There are some antivirus programs who block your Office apps or your cloud sync functions which cause your account to crash.
• Poor internet connection leads to failing to cloud sync or saving.
• Expired trial version, invalid license or account sync issues can stop you from opening and working properly.

There are several reasons why your Office 365 keeps crashing. But don’t worry, we will provide you solutions to resolve the problem.

Quick Troubleshooting Tips

Sometimes, a minor fix can solve this crashing problem. Try these tricks to resolve the Office 365 problem.

1. Restart Microsoft 365 Apps: This one is simple, close your apps properly. Then, start it again.
2. Update Office 365 Apps: Run any Office apps and go to the Account Settings. Click on File, select the Account or Office account option. Check for any updates. If there is, click on the Update Now button.
3. Use Microsoft 365 in Safe Mode: Open the Windows search and search for Office apps. Click on the Office app shortcut while holding the Ctrl key. You will see a prompt to start the Safe Mode. Hit the Yes button.
4. Clear Office Cache: Press Windows+R hot keys and type: %localappdata%\Microsoft\Office\16.0\OfficeFileCache. Delete all files and folders from this directory. This way your document cache will clear. If you want to cache the Teams, type this: %appdata%\Microsoft\Teams. Delete cache, blob_storage, databases, GPUCache, IndexedDB, Local Storage and tmp folders.

These are the simple troubleshooting ways to fix your Outlook that keeps crashing. If by doing this the problem does not solve it, you have to use a bigger solution.

Repair Office Installations

On Windows 10

1. Right click on the Start button.
2. Select the Apps and Features option.
   
3. Choose your Microsoft 365 product and click on Modify.
   
4. Click on Click-to-run and follow the instructions to complete the repair process.

On Windows 11

1. Again, right click on the Start button and select Installed apps.
   
2. Choose your Microsoft 365 and click on the ellipses. Select Modify button.
   
3. Then, choose the technique to repair your Office programs.

Disable Hardware Graphics Acceleration from Registry Modification

1. First open regedit from the Windows+R dialog.
2. Open Registry editor by clicking Yes to User Account Control prompt.
3. Now, we backup the registry, by going to the File in the Registry editor.
   Set a location and click save.
4. Navigate to this path: HKEY_CURRENT_USER\Software\Microsoft\Office\\Common\Graphics (replace to 16.0 for Office 365).
5. Right-click and then Select New >> DWORD (32-bit) Value.
6. Name it: DisableHardwareAcceleration and set value to 1.

This process is used to fix the crashing problem of your Microsoft 365. Here are the solutions that can resolve the problem of Office 365 keeps crashing. To make sure this issue never happens, we provide you preventive tips.

How to Prevent Microsoft 365 Keep Shutting Down?

• Make sure you up-to-date your Office and Windows program.
• If you use unwanted add-ins, disable them. To do this, in your Outlook or Excel, go to File >> Options >> Add-ins. Click on the Manage COM Add-ins option and press Go.
• Clear your Office Cache regularly as well. So, that the problem Office suddenly crashes will not happen again.
• Download the free Microsoft Support and Recovery Assistant which help you to diagnose and fix the problems of Microsoft 365 and Windows.
• These tips are used to keep the crashing problem not happening again. Securing your data is also important when it comes to this problem. So, we provide you a way that can help you save your Office 365 data.

Final Words

Office 365 keeps crashing is a common issue faced by many people. That’s why we wrote this article to help you solve the problem. Here we provided minor troubleshooting solutions and advanced methods that you are able to fix the crashing problem. Furthermore, we also suggest tips that can prevent this problem from happening again.