Troubleshooting Down Page Button acting up on 4th Gen Kindle

[Palm Tree]

In the last few days the Down Page Button on my old 4th Generation Kindle has not been working right.

If I try to move down the page to select a different book to read, it often does not want to move.

Or if I want to move down the page to change the setting or whatever, it doesn't always want to move down the page.

It's a pretty old kindle so maybe there is nothing that can be done, but I thought I would ask if anyone has any suggestions.

Thanks in advance.