As a last resort, you can also try uninstalling and reinstalling both R and RStudio.
If that still doesn't work, the only other guess I have is that this could be related to some other software installed and running on the machine that is somehow interfering with RStudio's normal processing. Some examples we've seen before:
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RStudio crashes when Dell Backup and Recovery software is installed: "Rstudio has stopped working" when trying to import data
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RStudio freezes after open for a while, when Nahimic from MSI is installed: Fresh Install keeps freezing a few minutes after startup
It could be worth investigating whether closing some of the other software on your machine makes a difference.