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Could you please tell us which version of Office are you using now?
On my environnment with Microsoft 365 Apps installed, I can not reproduce your issue.
Sometimes since the hotkey, please check whether Ctrl + Fn + PgUp/ PgDn key is helpful.
Here is a similar thread you can have a look "CTRL Page Up/Down".
Such as using Ctrl key to run Excel in safe mode, safe mode of Excel can help us troubleshoot the add-ins.
In this link, it also suggest you create a new adminisrator account (Windows profile), running Excel in this new local account to check the userprofile and check whether there is any third-party software causing this issue.
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