What could be the reason for the sudden failure of Google Sheets modal dialogs to respond to interactions?

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There are several possible reasons for the sudden failure of Google Sheets modal dialogs to respond to interactions, including:

1. Technical Issue - This can be a result of a system error, browser issue, or temporary glitch in the Google Sheets application.

2. Internet Connectivity - This can also be the result of network connectivity issues, which can cause delays or interruptions in the communication between the Google Sheets application and its server.

3. Browser Cache - The temporary files and cookies in your browser's cache can build up over time, which can sometimes cause issues with modal dialogs, menus, and other features in Google Sheets.

4. Extension Conflict - If you have any browser extensions or add-ons installed, this can sometimes conflict with Google Sheets, preventing the modal dialogs from responding to interactions.

5. Account Permissions - In some cases, it can be a result of restrictions on the account that is accessing the Google Sheets application. For instance, some users may not have the necessary permissions to perform certain actions or access certain features.