Why is my Excel sheet not responding when I try to save or close it?

1. Check for updates for Microsoft Office and install them if available
2. Run a scan with a trusted Antivirus program to eliminate any potential virus, malware, or spyware
3. Check if your Excel file is too large
4. Try should repair the file
5. Try restarting the program and computer
6. Check your internet connection and try to move the file to an internet-free folder or USB storage