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Hi Frederik,
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Thanks for posting details about your concern here. I didn’t encounter this kind of issue before, based on your scenario, I have done many research, this kind of issue might be caused by browser cache, so I recommend you could try to clear your browser’s cache, then try to re-install Office app again, and view if outcome is different.
If above method doesn’t help, according to my experience, this issue might also occur when there is conflict between Office app and other individual Office app, if it is convenient to you, you could also try to uninstall other individual Office apps, then re-install Office app and view if it works. Note: Remember to back up data in advance. Besides, there is an official article (https://support.microsoft.com/en-us/office/install-and-set-up-office-on-an-android-cafe9d6f-8b0c-4b03-b20a-12438a82a22d) that mentions some questions related to installing and setting up Office app, you could also have a check if it helps you.
Further, about the notes, may I know which kind of notes that have lost? If you store them in Office app, they should sync with related server, please offer me more details about it, so that I could offer you further suggestion. And If Office app still crashes, I’d like to confirm if you modified any setting in your computer or added certain app before the issue occurred, please quit other programs when start Office app, and see if outcome is better, if processor still gets a workout and the fan gets crazy, please capture screenshot of your task manager for further analysis, thanks for your cooperation.
Kind Regards,
Betty