Writer and Calc garbles or contorts text when scrolling

I use Windows 7 (desktop) and 8.1 (laptop) and have LibreOffice version 5.042 (x64). Often, when I scroll up or down the page, the text (or cells in Calc) get “broken up” or contorted. It’s as if the original page was frozen and when you move, it breaks up the page–lines overlap, etc. I need to either switch to Print Preview or close and re-open to have the page display correctly. Thank you.