Hi @Rakesh Kumar Sinha,
Did this problem only appear in Excel?
Did this problem appear in all Workbooks?
First I suggest you open it in safe mode running the following command: Press Win + R, type "excel /safe" in the blank box, press Enter. If it works fine in safe mode, please check the add-ins in your excel and disable them.
Click File > Excel Options > Add-Ins on the left side of the dialog. Then click the drop-down arrow at the bottom of the dialog box and select "COM Add-Ins" from the list, then click the GO button. What comes up is a list of COM-Add Ins that are loaded and running.
If the issue still exists in safe mode, I suggest you to collect the event log and provide us with the whole error messages of event log.
Steps of collecting event log:
Open Event Viewer to check whether there's any error about the Excel/Word crash issue.
Press Win + R, type "eventvwr" in the blank box, press Enter. In the Event Viewer, browse to Windows Logs -> Application, there may be some errors after the crash.
Please try to collect this event log and post the whole event log message here. I can get more information about your issue from this message and help you solve it.
You can also refer to this support article to get more information: https://support.microsoft.com/en-us/office/excel-not-responding-hangs-freezes-or-stops-working-37e7d3c9-9e84-40bf-a805-4ca6853a1ff4
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