Why doesn't RStudio give a way out?

I am new to R and have had a strange problem lately.

When I open a new R session everything works fine .. but after a while some commands stop working. when i execute this command:

getwd()

      

        
        
        
      

    

output:

> getwd()

      

        
        
        
      

    

Instead of showing my working directory, it just displays the command that was executed.

After working with the session for a while, the output of the variables also ceases to be displayed. I have to close the whole Rstudio and reopen it to fix this problem. It wastes a lot of time.

How to get out of this?